Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c265c5434f16456…

MALICIOUS

PDF

60.3 KB Created: 2020-12-14 01:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e7d81cb9234a48340437de2818df77e SHA-1: 7b104ede3df2d9a5f4522a7e3fe05463d6c85e48 SHA-256: 9c265c5434f164567b634f20df7e54a028ae0ea0d4c28f92fd46ac787428e690
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to 'trafffi.ru', suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffi.ru/strik?utm_term=nintendo+dsi+charger+gamestop
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/folojoreber.pdf
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5fbd3a192dd14.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdf
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5fa4d4b8ea139.pdf
    • https://cdn-cms.f-static.net/uploads/4479925/normal_5fb77531d2121.pdf
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5f9da1a87ab78.pdf
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/ropusikunozuzodev.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/855a07bdfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bubeto/21252360091.pdf
    • https://static1.squarespace.com/static/5fc3655816f6d44b07ce9520/t/5fd22c9a23f2866aa392e0d5/1607609498679/famodugawen.pdf
    • https://s3.amazonaws.com/jizubisetebof/biuret_protein_assay.pdf
    • https://s3.amazonaws.com/wizidimawag/lebevu.pdf
    • https://s3.amazonaws.com/jenisozazewubo/simple_loan_promissory_note_template.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_off0000ad11.bin
c7fc30846a9224e99179c2757c294b6f6bfcd95d72984cffde3bae9cdb786128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD11 5424 bytes
font_01_sfnt_off0000bf60.bin
a8ac6ff66b542a72c124ad613c2bd8e2474a8e5e8fb3368345035c9670c1b14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 10484 bytes

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