Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9cf9a6115527ad…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 14:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 93472938de6a8f25240bf1c9423c66f9 SHA-1: 4ee29f83455dd3f5fa1ff65153b5f78d5bf18c00 SHA-256: ac9cf9a6115527ada1b61c6318cead71ec914e7d8885bc5ae8b475df3b2e4065
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identifies it as a link farm designed for SEO manipulation. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=gledai+filmi+online', suggests a lure related to watching movies online. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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 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://kuzutuzo.ru/strik?utm_term=gledai+filmi+online PDF link annotation
    • https://cdn.sqhk.co/dilipokoje/e1ZIcWL/19699918379.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/ciaThep/demigods_and_monsters_summary.pdfIn PDF document text
    • http://yarrebitteh.online/physics_workbook_answers_marshall_cavendishpo1m7.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/junipidawusifit.pdfIn PDF document text
    • http://maleev.online/batoroslekw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_6027393dbbfc2.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/2734090.pdfIn PDF document text
    • https://levonosaxedose.weebly.com/uploads/1/3/2/6/132695543/9277304.pdfIn PDF document text
    • http://opssmall.space/frosty_the_snowman_song_lyrics_and_chordsgrjeb.pdfIn PDF document text
    • http://wonnaturila.space/rejusugatelibagubibijrizf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_5fd95a52d4e4b.pdfIn PDF document text
    • http://urott-hu.com/30291510542dpu7r.pdfIn PDF document text
    • http://latatal.iblogger.org/wafibusoboxitipini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/burger_and_lobster_nyc_menu.pdfIn PDF document text
    • http://soromivimurug.epizy.com/konuzerosabavapejajasowe.pdfIn PDF document text
    • http://rabogefegu.epizy.com/tagimukupowawekelaloz.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/aaa_logo_free_with_crack.pdfIn PDF document text
    • http://mitegoma.rf.gd/aplicacion_para_aprender_ingles_gratis_iphone.pdfIn 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_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 4808 bytes
SHA-256: ef3736fb33e0745a79f5f6dfea9e8babefd145c513c38cde97a0c43276907a08
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 15452 bytes
SHA-256: 674190bb55d0d9b409d6a2cf3fc6a923121a6aa52bb0a3cc4ded1af62fe80afd

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