Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7c9545cd4ffe6c…

MALICIOUS

PDF

69.2 KB Created: 2021-02-17 20:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64d9da49f7dc47bc7376a423b8c9e31d SHA-1: 4c4af76fa9d108219c9137e6c44d4a68351b81b3 SHA-256: 7c7c9545cd4ffe6c8dcb9a3d43ecea8cb6a2fb724206db7df08da51421a6c6fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=the+squat+bible PDF link annotation
    • https://cdn.sqhk.co/todusukiraxi/hgDQ9gc/athletic_apparel_industry_market_share.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_600dd7c7e46c8.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/mabisejebebi_fobefukudixifer_tenuruve_donozuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fdfa1b1a4ea4.pdfIn PDF document text
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/ea29ecd5250e20.pdfIn PDF document text
    • https://cdn.sqhk.co/muwesisokim/c2jcRge/31185848605.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/cjjhhie/spider_stickman_rope_hero_mafia_gangster_vegas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_600121c826eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_600be86d95987.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/rMZd1hd/39637963169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_5fed0e667753d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_6010d630d89b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_601c76e9cef23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5ff1dab5090b5.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/9gcw4ia/52195827600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 4892 bytes
SHA-256: caaa9ef60fea7a5b0c69151d1ba97e5bbea0d9666b555c9923241554cd148c9c
font_01_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 11176 bytes
SHA-256: b74bc662e3e33fd87df7c549b45b027f9ca1b8c2696e53084f04b7167e847649

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