Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8102e1fab11a9bb…

MALICIOUS

PDF

78.1 KB Created: 2021-02-12 00:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c8725b0020c1aa41e108cda83a9e19e1 SHA-1: 53653e2332a467e56ac88d2a571f90e165bf2007 SHA-256: d8102e1fab11a9bb561b92110b6271f771062e36e35a3fdd3fb85367ec7d3a8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting domains, disguised with search engine optimization-like terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/123?utm_term=vampire+vs+werewolf+anime PDF link annotation
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/7687697.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/jbmijUq/dagonadalavevir.pdfIn PDF document text
    • http://gadokuzepot.22web.org/naqaab_bengali_movie_720p.pdfIn PDF document text
    • http://pabixigenived.22web.org/human_centipede_full_movie.pdfIn PDF document text
    • http://prizinsta365.site/92503369925ol348.pdfIn PDF document text
    • http://goossyy.online/631830601972y66a.pdfIn PDF document text
    • http://ital-girl.space/the_chrysalids_audiobook_freezu0ab.pdfIn PDF document text
    • http://smartradiobf.ru/aerodynamics_for_engineering_students_7th_editionqokce.pdfIn PDF document text
    • http://logvoz.ru/wemarofetojuwufulipwe9yf.pdfIn PDF document text
    • http://vanlit.ru/90661284101842a8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 2888 bytes
SHA-256: c82bebd4b493aaaf84143f05ff6967641e6933e4069ecd51460b008fb5b9cf8a
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 5164 bytes
SHA-256: 92d96edc7c13a62f018f068017f44dc15c7a236b46bf4bf3fc09931a59795528
font_02_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 10932 bytes
SHA-256: c59f21fc1f579b63fd07faf40c1de08c8fabe9524785921addb59e778a1145fd

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