Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5feeefaffd30db…

MALICIOUS

PDF

64.4 KB Created: 2020-11-24 16:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da7b8475241a67c003b5c287d797c476 SHA-1: 1fdf86f4b1c8a4348e5f7adad691092edcedded8 SHA-256: 8c5feeefaffd30db46160ecc174fac04570b728c07a746ecf87743baaf5b906b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=williamsville+north+high+school+andre+thomas'. This indicates the document's primary purpose is to lure users to a potentially malicious external resource. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=williamsville+north+high+school+andre+thomas
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5f8eea1cafbc8.pdf
    • https://cdn-cms.f-static.net/uploads/4422134/normal_5f9d1a9fb8eea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e09b0966-1745-47ac-afef-080dd51cef52/ribusaz.pdf
    • https://s3.amazonaws.com/levumoduf/compound_machine_definition_physical_science.pdf
    • https://s3.amazonaws.com/lotibabakuj/assignment_abroad_times_today_free.pdf
    • https://s3.amazonaws.com/bulolimepol/4375661774.pdf
    • https://s3.amazonaws.com/nitizobuv/joluritoxizifazas.pdf
    • https://s3.amazonaws.com/vajefam/67063108478.pdf
    • https://uploads.strikinglycdn.com/files/0afb92b9-e787-4fd3-9c70-65d1baa33e6a/wameke.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_off0000bc5b.bin
a6695f909432a2dadeb9cb9f3d7d81f0f98263bd456502e5d2d2c02a80ece5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 5428 bytes
font_01_sfnt_off0000ceb7.bin
36b8303517e883dc2027465fae775531acbf339f251d941b7e1a8cf6eb0518a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 11512 bytes

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