Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d937ad2f45eec0c…

MALICIOUS

PDF

73.0 KB Created: 2021-01-02 17:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce16cffe9dede0d7315ac3c168a9830d SHA-1: 724c4ec3213c49bb784ec546724bdac0da59e306 SHA-256: 6d937ad2f45eec0c4eb05833fb4e03286aadbb2373bc9f54d44535ca91dfd2f1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to obscure the ultimate destination or to host multiple lures. One of the primary external URIs, 'https://trafffe.ru/123?utm_term=history+with+mr+green', is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=history+with+mr+green PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416299/normal_5fc423f5c6a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_5f9eee6dab468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fa669546fbe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fe810f62d4ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f90993c33ec3.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/hehjRRR/longhorn_eclub_sign_up.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fceacf2cfbea.pdfIn PDF document text
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/laxomil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8712423f973.pdfIn PDF document text
    • https://sinisedowinixa.weebly.com/uploads/1/3/4/6/134679082/5013346.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/rumiluniwininurege.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/hBUjhWF/xakupafog.pdfIn PDF document text
    • https://tinalolovini.weebly.com/uploads/1/3/4/3/134371967/jewodenunezelu.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/vwiaja7/my_first_piano_adventure_writing_book_c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 5012 bytes
SHA-256: 85227f86fe30b11e21d8085fa23f8f2c3efc01eb18a4786438911a9c53e48c82
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 11392 bytes
SHA-256: c811e316b4507b24bbf22940105c91facce372cf5131127b956f27e6a6795988

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