Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f708b4b32090df…

MALICIOUS

PDF

68.4 KB Created: 2021-01-15 12:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 01fa815660d330d9f9e235d59fb2455d SHA-1: e1e46cb6f02aeafbb4b7fbd4a93036acb6aebf13 SHA-256: 82f708b4b32090df5847e97b1989992dc6f73be5d789ddd7b7b62cc29bff0f5a
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/wb?keyword=lego%20hidden%20side%20school%20bus%20review PDF link annotation
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/395b7c2180.pdfIn PDF document text
    • https://site-1176713.mozfiles.com/files/1176713/81095092682.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/fiberajutorati.pdfIn PDF document text
    • https://site-1180493.mozfiles.com/files/1180493/wunirowodikapajopigaxipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f8fccf68af99.pdfIn PDF document text
    • https://site-1176492.mozfiles.com/files/1176492/farming_jobs_near_melbourne.pdfIn PDF document text
    • https://site-1175371.mozfiles.com/files/1175371/zombies_smashy_road_wanted_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vuguvorexi/Lhj2ghN/crazy_zombie_9_unlocked_hacked.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/kewuxejikiwe/gitonesexunamiguwo.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/5867526586.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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 5224 bytes
SHA-256: 130af4acee42ae987bd2576333b146f9b984d496d986a57034d05b17a66ff2b0
font_01_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 10392 bytes
SHA-256: 530174b103f2912b180c66b96592e8348fd55eca6ae9e0bb4966f8cb2cd0e8b0

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