Malicious PDF — malware analysis report

Static analysis result for SHA-256 86978f41c48060eb…

MALICIOUS

PDF

72.2 KB Created: 2020-12-25 16:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b10cb982a02cfa2c21cccb71a3417d37 SHA-1: a9c11fc5f46c489313137b6ef100bf355e767f4c SHA-256: 86978f41c48060eb080aef5300c92f8c6f0b3e36dcf06790d9068df8d099d175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large farm of external PDF links. One of the primary external links points to 'traffset.ru', which is suspicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/aws?utm_term=rpg+games+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376099/normal_5fde79e5d064b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f88764981742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fc177187152d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f9ef53b6eb56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5fcf4ace90631.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/popogewu-xopafuxi-furagunol.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/Uiai8if/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_5fd79bd185f2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3baf5e85-2951-46ee-8d9d-4bacc73ef7e6/toy_story_4_full_movie_123movies_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302c084c-6318-4346-94e5-a43e07b42e43/7891408692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8e98a0-17bd-49c1-87e6-ffc7a07c3155/41882994546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3c01ac-34cd-4ada-8ba1-4ce1b226f848/94102906930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835b905f-b8ba-46fb-beaa-3617c9c46bc9/pefaxalalixokozopi.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/fupokafusupidemezajetum.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/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://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 5052 bytes
SHA-256: 51e3419fb76b49c51ab8e2329b45e237f38980094f848a556608dce87e886b52
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 11748 bytes
SHA-256: 1c666383af486f281615c263866dca788c4b8a773ea7bb46ae2bb738bfdca7e0

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