Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4043c0df966c02e…

MALICIOUS

PDF

59.1 KB Created: 2020-12-19 19:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f47566617283afa44f9847c064feba SHA-1: aebee1d0d47268b4e5bb1a4d5b37badd7b3318c7 SHA-256: c4043c0df966c02ec748503e32774208aa9d68b73def7dfbdd2e1c2c3191880e
124 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one pointing to 'traffset.ru', which is flagged as a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to obscure the true malicious destination. ClamAV detection and ML classification further support its malicious nature, suggesting it's used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8007

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/strik?utm_term=mortgage+in+spanish+slang
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5faa5208126d3.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f89132318c91.pdf
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5fd85c79982da.pdf
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/rolamuma.pdf
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/5343452.pdf
    • https://jabipiduluw.weebly.com/uploads/1/3/4/6/134662585/2626441.pdf
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5fc69e37de1a0.pdf
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/1738993.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05233e62-e1de-412d-8c86-8dc86622c192/shorkie_puppies_for_sale.pdf
    • https://s3.amazonaws.com/xukonakefules/dukiresex.pdf
    • https://uploads.strikinglycdn.com/files/ddac2a99-7a47-4316-b5ae-916ecf2e701b/89068946060.pdf
    • https://uploads.strikinglycdn.com/files/98988ad6-8109-48cb-ba53-7a0cc2da82b0/vcp_5.1_study_guide.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf27.bin
521707824fc606fdcf947b7abb12ecdb6e0ca4c9ba7155bd2083a8ab0ce87c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 5084 bytes

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