Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6c05cdd938d61a…

MALICIOUS

PDF

72.6 KB Created: 2021-02-04 05:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fcb45df85f7bdb62122fa578dca88f37 SHA-1: 955454000a2ee24bb9c6a03e67b08ec2cd9c26e4 SHA-256: fc6c05cdd938d61ab874c55b7752369e7d6e5f266e588f151c1ba8de812b1d76
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/aws?utm_term=free+online+job+interview+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/wajidafix/V2hdzD7/xipunuvoked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_600a23d9eed50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_600dc4e7f15c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_601703a14ff80.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/ia6oQ8m/super_loud_ringtones_for_hearing_impaired.pdfIn PDF document text
    • http://best-store.club/descargar_dragon_ball_shin_budokai_3_para_ppssppm3vh5.pdfIn PDF document text
    • http://euroshopmn.space/39120296073cbutk.pdfIn PDF document text
    • http://national-verifyteam.com/31139328833b05cq.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/ap6ja9h/aircraft_war_game_1914.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/xegafupomenuziwaj.pdfIn PDF document text
    • https://cdn.sqhk.co/bovuzane/ggghgfU/fodujadizeve.pdfIn PDF document text
    • http://topstudy.fun/bomatogewuxapau6gqq.pdfIn PDF document text
    • http://help-copyrighteamservice.com/59101669353nkgzo.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5268 bytes
SHA-256: 67280144c3bff49e58732aae0d5b5d469032f65be997b69ccc08989959da2b13
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10396 bytes
SHA-256: 8d4acd2522bc155bf457349b5cff59def982518483ae8917f5c4a0b9269e2b31

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