Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a39b3a604b4bbf…

MALICIOUS

PDF

79.3 KB Created: 2021-02-15 03:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b983b24724a433726bf26b8d1beb44a6 SHA-1: 50c4be708c893d0417e52897e62ed145053b4812 SHA-256: 80a39b3a604b4bbfd636c62287adc156b1655d5df8c48352eede9339219d1387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. The primary URL, 'https://seumenha.ru/wix?keyword=types+of+flavoring+powder', is likely a lure to direct users to potentially malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://seumenha.ru/wix?keyword=types+of+flavoring+powder
    • https://cdn-cms.f-static.net/uploads/4418191/normal_6028f9ae3aeff.pdf
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5fd5efdf77d6f.pdf
    • https://static.s123-cdn-static.com/uploads/4494146/normal_6008a529d070c.pdf
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/wijewikabit_riwobarumibu.pdf
    • https://cdn-cms.f-static.net/uploads/4469638/normal_5fd8cc197f5f2.pdf
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/kufowibizelo.pdf
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5ff97ca5ca792.pdf
    • https://static.s123-cdn-static.com/uploads/4452376/normal_6002932a0a76a.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fdbda7749431.pdf
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5fea283fd02dd.pdf
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fdba97493932.pdf
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fedcc02021d0.pdf
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff0b20192198.pdf
    • https://static.s123-cdn-static.com/uploads/4495849/normal_6003589d1ecd5.pdf
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5feb57d026cc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://muwalolerede.epizy.com/23541892406.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e414.bin
55b3d5968f6d509403b7826ce96a807a7133c9139180eaefb428423eded9e33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5412 bytes
font_01_sfnt_off0000f6ae.bin
23577da7239134d1188cc3b25dd1c5f619614e12c72c3b5288db38d1bd1f26c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 10508 bytes
font_02_sfnt_off00011aae.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16164 bytes

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