Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c07fd0d359573c…

MALICIOUS

PDF

71.0 KB Created: 2021-03-01 15:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc36df0773cabd8e62394b3e976073d5 SHA-1: d47d0ed05071cb73a10a077dae7fc8bf7f4013d1 SHA-256: c4c07fd0d359573c8b3e2010e618012a010b397ef773cc087189b72bcadc725b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it's designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's primary purpose is to act as a deceptive link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=what+does+radical+republicans+stand+for PDF link annotation
    • https://cdn.sqhk.co/vedukosamo/igFYSjj/32282811342.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/jeicfUX/sajukazumunadaruwijemeg.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/jgjbjft/star_wars_fallen_order_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/bQOjfT6/taxawimato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_60275656b73cb.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/rjhjd6B/gun_firing_sound_download_mp3.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/26816188539.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/basketball_shooting_drills_for_high_school.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/what_is_feminism_in_literary_theory.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/dibujo_de_cara_de_nio_para_pintar.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/ghh7gmp/free_flight_combat_simulator_games_for_pc.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/american_heart_association_bls_exam_answers_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowulibi.rf.gd/gakobipoduvajezorovevaga.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5396 bytes
SHA-256: be12d0ad86750193d76d14dd1530a333113ab1d155fbe6242aa11ebf3679ba5a
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10152 bytes
SHA-256: b3004c3d35b364d8e4cf66d126f3a2de20fd6568a3f58294bc48b9e176dc1ac8

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