Malicious PDF — malware analysis report

Static analysis result for SHA-256 920176a484b655c2…

MALICIOUS

PDF

84.9 KB Created: 2021-03-13 21:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2fed344f1df44bd0b8851315492936b6 SHA-1: b6ec656d962f8ecddc759b6075d14bb859e90b2a SHA-256: 920176a484b655c2bd1d9c858b76728a90c15b116f0e628c6ecb0292290d9f3f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/123?utm_term=baseline+survey+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501962/normal_60394d7cd8b0e.pdfIn PDF document text
    • http://alsamcctv.com/3121761449950x7k.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/gejunozedajaje.pdfIn PDF document text
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/vusitusij-kewimijumiru-kasamow.pdfIn PDF document text
    • http://armlur.space/pastor_joel_peebles_and_mike_freemann21ri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392220/normal_5ff3fabb80f3d.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/ziwelugigasuna.pdfIn PDF document text
    • https://rupuleda.weebly.com/uploads/1/3/6/0/136002844/c84722dc9232a30.pdfIn PDF document text
    • http://my-favshoph.online/faruvo95vtq.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/zirosupukural-pebam-pexowopateb-vimunu.pdfIn PDF document text
    • https://xofivexaroza.weebly.com/uploads/1/3/4/3/134321457/5570646.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/sadur_vekagep_bibenag_fakifuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_3b3b030f39af4548a5c19d1d18238136.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_fc021afe15c94d6697d2604515262fdd.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_34d8bfff64c04bd2b9f19654372e6052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/sundance_spa_sentry_850_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/why_isnt_my_scanner_scanning_the_whole_page.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_d21be5d979ff49aca2239b2318e9da6c.pdf?index=trueIn 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_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 5124 bytes
SHA-256: ac8ffe7358674b99286a44e297341847da8d6cd33d6acc6cdbc57bfc46039a09
font_01_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 10328 bytes
SHA-256: 7c1bef108d8cc54d4a5b6060761b57393ef60c0dabf20385999524d77e8c0f68

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