Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7d89b1fa853b6a…

MALICIOUS

PDF

81.0 KB Created: 2021-02-19 13:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 492d3fd83cda9d3213387273c38dd229 SHA-1: a616a1f502eebefb15b4e28682467f145665e368 SHA-256: ee7d89b1fa853b6a6ea8a21c14299887329d59d4c44476de194f28c3151552bb
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF generation and potentially embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=the+principles+of+product+development+flow+pdf PDF link annotation
    • http://sberpodarok2020.online/java_spring_bookz333m.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/e8shjna/roberesevikamuloxadez.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/f0jjS0q/poladi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5ffcb90b97b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5ff188d2b735b.pdfIn PDF document text
    • http://dedekuwetom.iblogger.org/insect_glaive_leveling_guide_mhw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_6014320dadc93.pdfIn PDF document text
    • http://giocodigital.space/2pac_all_eyez_on_me_instrumentalfrt41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5fda0106ed95f.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/dAidBIa/walokimerajepujopomis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_5fda44fd3806e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5ff788daa7178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5fed999617eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_6028b13ee7865.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/gcmgchf/fitness_home_home_exercise_30_days_body_workout.pdfIn PDF document text
    • http://avtoshkola-region26.ru/408877420059tw6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babupit.epizy.com/nipabofolipuvafipipomate.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/formule_semi_dveloppe_du_dioxyde_de_carbone.pdfIn PDF document text
    • http://lugaderova.epizy.com/28055915282.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_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 5284 bytes
SHA-256: 0ee8c450f9ce3149a739d4e865ad690734445872943e92b51f583a5c4f9c582f
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10492 bytes
SHA-256: 30d25658feb068639e1ee2f5a8be54c49b17a262cea8a74308861a99f66ed8c8

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