Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4d7fe4844682c2…

MALICIOUS

PDF

68.4 KB Created: 2021-02-23 02:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c02d189167e979aaeccd93f964ea800 SHA-1: a5fc95bfa7399fd1c43c4c0126a6d9429efc77c7 SHA-256: ac4d7fe4844682c27fb651fcebc9219c567a722116dfdcea407ffb9904b3c872
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to known malicious redirectors or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=section+3.1+the+rock+cycle+worksheet+answer+key In PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jf6Klhc/girl_voice_changer_fortnite_trolling.pdfIn PDF document text
    • http://salet.store/automobile_engineering_vijayaraghavan_bookkjsql.pdfIn PDF document text
    • http://aduo5.online/zigifageb4lf.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/48lIheS/twist_hit_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/jgfjdha/woodworking_projects_for_christmas_gifts.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/scalp_plexiform_neurofibroma_radiologyvetvo.pdfIn PDF document text
    • http://iqecoportal.ru/30113830496rvl2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_60128badc8b06.pdfIn PDF document text
    • http://skameyki.club/lipenuwujufadudz9f4.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/csWihic/my_dns_server_is_not_responding.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/agdvol9/batavomipag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_602e4caef10c3.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/nagudo/hungry_dragon_mod_apk_2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/13009270982.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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 5496 bytes
SHA-256: 01377e7fab62ffdabbe5c9477c820cb1c3d78250241334714b5d938b697fa6f9
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 10560 bytes
SHA-256: 3c814d8037cc975dcce529de1a2e2d217d46ee230ae59f8ea8ffd187ff5cde9a

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