Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ac21d66d82fd71…

MALICIOUS

PDF

68.7 KB Created: 2021-04-18 10:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 88b7abfb5ebf04c5f47b26d31a9ede66 SHA-1: cbc0536805771f320c31fd6a9efb96ff1e841e26 SHA-256: 07ac21d66d82fd71a86d1ecaa81a9b2fd15a091dcc76a04cff302bf3ddfbbb2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'Agatha Christie poirot books free', suggesting a lure to attract users searching for free content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=agatha+christie+poirot+books+free PDF link annotation
    • http://jiviwizun.iblogger.org/78701047648.pdfIn PDF document text
    • http://daating19.site/2611532989246jy2.pdfIn PDF document text
    • http://igclienteam.com/24892752460ddegk.pdfIn PDF document text
    • http://site-shop.xyz/tososenomykkn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_603ea872c9ff6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_5fe061ee0340d.pdfIn PDF document text
    • http://mif-smeh.space/bifefe1go1j.pdfIn PDF document text
    • http://imedo.ru/data_manager_job_description_clinicalcorrs.pdfIn PDF document text
    • http://noksipals.online/best_quotes_from_eleanor_and_park_with_page_numbers4yxbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_605383f650864.pdfIn PDF document text
    • http://apparentlyopt.com/pobebiluxokopoga6fnwt.pdfIn PDF document text
    • http://elinekici.online/biranasesivuskusy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fceefef3d6ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://luzadewo.epizy.com/95197315563.pdfIn PDF document text
    • http://nibejodawugizex.rf.gd/business_plan_for_software_development_company.pdfIn PDF document text
    • http://rivejekab.epizy.com/mijazafijekorukamafi.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_84a6b694a0cd422da656601d696596c1.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_96c13e8ec8e141cea4bfa8c4b5269203.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_669a5c8a916149aa91658ebeff7f90e7.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_5fd96e2063174483817b5dddb4248a12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 5120 bytes
SHA-256: aa2eb698418ac0a963b5398272e2d595eb5880a2c4fd7459b09083faf97c86d0
font_01_sfnt_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 9540 bytes
SHA-256: 005068e926a8b2b734aaea6c21f3669a3327b4e81353b292b7d7c2dec227de4b
font_02_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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