Malicious PDF — malware analysis report

Static analysis result for SHA-256 131746a22a196222…

MALICIOUS

PDF

69.8 KB Created: 2020-11-12 17:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d51d0524bf83a3c0242cf66ce63655 SHA-1: 9e8ecd2da1f7a0a916e3241ec0b019b692079d7b SHA-256: 131746a22a196222d6382bc6f22cc9a079fc01ce80eeb291bb01d479a95beb21
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one pointing to 'traffine.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to a game launch issue, likely a pretext to drive traffic to the malicious URL.

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://traffine.ru/strik?utm_term=wolfenstein+the+new+order+wont+launch
    • https://cdn-cms.f-static.net/uploads/4470826/normal_5fa74c4f8099c.pdf
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5fa4c791c33e1.pdf
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/fonosapivomad_dexeverabibu_nevoviletapup_kefukexemuzor.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/7099332.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f9f6add0c760.pdf
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f9cc4fc11c8a.pdf
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/wipivamunapuk.pdf
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/tebuzo_suramewawiwuw_forotejimugone.pdf
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f9ae23787f20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divelatoxa/85981032716.pdf
    • https://uploads.strikinglycdn.com/files/784b7052-8b96-49ba-a629-a4ccda674e81/petedaveforufufusamamew.pdf
    • https://uploads.strikinglycdn.com/files/16cec609-f069-49b1-b302-9bdd23babe7e/role_development_in_professional_nursing_practice_5th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/e43faee6-83d6-4fb8-8520-7d238feffced/93573252131.pdf
    • https://uploads.strikinglycdn.com/files/46249890-ca42-44c3-ad9d-38023978dc32/93074495509.pdf
    • https://uploads.strikinglycdn.com/files/464fd0dd-f9c1-4565-a866-04d6a242a6c9/49274860348.pdf
    • https://s3.amazonaws.com/gulapore/25076501615.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46f.bin
dba166f30c2566ae2d5606b01b06b8f2e29f5c10f9db8c726950c44148998acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 5212 bytes
font_01_sfnt_off0000e63f.bin
d6c19a12931f6fac70c133137a9be0af82cabb43bbddba043405d2782701073f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 10540 bytes

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