Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd42599bec35b4d…

MALICIOUS

PDF

73.0 KB Created: 2020-12-06 14:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79ca25abf6c28a73e7af68f060f8c35 SHA-1: 11ead6cbd5899a3516b13c2b3a3f5d2943e9e44c SHA-256: 5fd42599bec35b4d955028946e7edc3d3bbc602e83ff4b314fbf2fd48f91fafe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, 'https://trafffe.ru/strik?utm_term=what+is+enlightenment+kant+pdf', is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+is+enlightenment+kant+pdf
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fb2de07f36c0.pdf
    • https://cdn-cms.f-static.net/uploads/4485823/normal_5fc069e315a87.pdf
    • https://cdn-cms.f-static.net/uploads/4455396/normal_5fbb836cbb14b.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8719e879df6.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/taxigefug-tafutunirebuza-morarotod-foremizosis.pdf
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8ede20c5069.pdf
    • https://dagevonedil.weebly.com/uploads/1/3/4/7/134736192/zilurokari-gigaxuluzefisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc0ca7740f1034a5ca83b63/t/5fc54c6e3c6ccf69f30d86d5/1606765678454/star_wars_bastila_romance.pdf
    • https://static1.squarespace.com/static/5fc36ab7a879396864183595/t/5fc954123825126da63cbe17/1607029778628/red_colored_rolling_papers.pdf
    • https://static1.squarespace.com/static/5fc4c956084698658e772771/t/5fca18458d0ac92c7be9938b/1607080009251/69011711268.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58a0a97599144eee8f5d/1606375584503/spokane_social_security_hearing_office.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43b.bin
7ecaa3ddbf190c928908601f251892bb91757c523f4b4dcfddc0a5717ecad529
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 5112 bytes
font_01_sfnt_off0000e57e.bin
8bd95507f83a1d9874a08347eecd06273ead6ef17552764073a1a73ad496beed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 10044 bytes
font_02_sfnt_off000107b3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 4324 bytes