Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5333a50c896503d…

MALICIOUS

PDF

72.7 KB Created: 2020-12-25 22:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d293cac17e036f618ef8ab536ee5a01 SHA-1: c849e959a79bb9b4f62cdfb57058500c92b559e0 SHA-256: f5333a50c896503dd5409d99b4744d5222e24f66b32e906595e4de34a48998ef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF link farm'. The primary URL, 'https://trafffi.ru/aws?utm_term=double+sided+postcard+template+word', suggests a lure related to templates. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=double+sided+postcard+template+word
    • https://cdn-cms.f-static.net/uploads/4489241/normal_5fac54231a154.pdf
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5fe0b7430da7d.pdf
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5fbf4776e9e16.pdf
    • https://cdn.sqhk.co/fijajiles/bZO3Qia/kawesedasupebod.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/1313b27da388.pdf
    • https://cdn.sqhk.co/ruzewekafan/kYhdjgh/98293175105.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8f3b7328f25.pdf
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5f9e138d5a27a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f756e29-84cf-4e37-903a-eae6e60a049d/online_horse_games_like_star_stable.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/immigration_canada_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/tutasujal/boxig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debe.bin
d96ab52c40396cc5e44878fc620c090efe75668e857866913ad77a94b2ae0e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 5452 bytes
font_01_sfnt_off0000f13a.bin
dc89b68ec9d30fb84448f4b3181d9dd11f7ad7011b588db15f966cb6125f4249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10628 bytes

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