Malicious PDF — malware analysis report

Static analysis result for SHA-256 502133b325d235a4…

MALICIOUS

PDF

63.0 KB Created: 2020-11-13 11:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f112bd529a5f07e0c186edc923de75e SHA-1: 3c4a3670afb75805a6f142158f311fc9e76ae6f2 SHA-256: 502133b325d235a456933b47d49459de6782676c3023272e8356ac0242029e2e
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=ejercicios+de+pronombres+personales'. This URL is likely used to phish for user credentials or lead them to further malicious content. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing pretext.

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=ejercicios+de+pronombres+personales
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fa06ced12a67.pdf
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5fade98d544d3.pdf
    • https://cdn-cms.f-static.net/uploads/4416659/normal_5fae2c0c3f9ab.pdf
    • https://cdn-cms.f-static.net/uploads/4426062/normal_5fa91e1a409d9.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f86f49472131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorulusof/67853654536.pdf
    • https://s3.amazonaws.com/bitajemisajoz/96894132089.pdf
    • https://s3.amazonaws.com/pidufozu/siralim_2_trophy_guide.pdf
    • https://s3.amazonaws.com/sisaxu/vixufev.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_off0000b494.bin
9fa2ac6470c454e2b51f7d0e05a750eccde7b903e9a2dadd3726d2f842279a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB494 5392 bytes
font_01_sfnt_off0000c6d0.bin
9f0d582e8b6c44fba229a477819e28e9c94ca609a77adf53b18e1b18cd00b97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 12128 bytes

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