Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfe3f74ef7e54d6…

MALICIOUS

PDF

80.5 KB Created: 2021-05-22 02:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 949dcb7e07fbaec81bbc81cdf47e3f90 SHA-1: 984ed1569649191dfc9f12d120368012a6049140 SHA-256: dcfe3f74ef7e54d6f8cab8f0837bf004fbfc6276f92872d918936b014c0a62af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs identified is https://bologen.ru/strik?utm_term=how+to+pass+your+drivers+test+in+arkansas, which is likely the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+to+pass+your+drivers+test+in+arkansas
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6025c207365c7.pdf
    • https://static.s123-cdn-static.com/uploads/4387718/normal_5ff55cd168d19.pdf
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/bimizaluvegovirugiju.pdf
    • https://static.s123-cdn-static.com/uploads/4378378/normal_5feb9a5637972.pdf
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/golatawelipiv.pdf
    • https://cdn-cms.f-static.net/uploads/4412895/normal_6048633f0cebb.pdf
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/dixozi.pdf
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5ff029c59bcc1.pdf
    • https://cdn-cms.f-static.net/uploads/4409396/normal_606e1fc09a38b.pdf
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fcc36bf762fd.pdf
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff770aa27b9a.pdf
    • https://cdn-cms.f-static.net/uploads/4404739/normal_605bf5e823121.pdf
    • https://rilumegunelado.weebly.com/uploads/1/3/4/6/134615428/6853496.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jadudusujuje/xebozizigekokejatisobawij.pdf
    • https://uploads.strikinglycdn.com/files/e0f3b4a7-e1c5-472e-80e0-205c07f7d571/what_is_multivariate_data_analysis.pdf
    • https://s3.amazonaws.com/wunupalezozerud/11102597849.pdf
    • https://uploads.strikinglycdn.com/files/f6de0622-d499-43c8-b2ab-2c29d2357e86/html_css_jobs_for_freshers_in_karachi.pdf
    • https://s3.amazonaws.com/rexogeguxosix/aiag_manual_free.pdf
    • https://s3.amazonaws.com/jevedijadiki/mixer_yamaha_mg124cx_harga.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_off0000ef4c.bin
bedf16695f0f52bf989ae0c02e11d4c511e5d70427dc35b570d7d8b288ef8d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 5084 bytes
font_01_sfnt_off000100b5.bin
72c8815ba1093bc39ddbbb5186c7d9f3d3845dabda0f629961893e133c15c5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 10888 bytes
font_02_sfnt_off000125fe.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 4324 bytes

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