Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da4987594b928df…

MALICIOUS

PDF

67.5 KB Created: 2020-12-24 12:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a4cc69c854b4027e1c4470d7be56db56 SHA-1: 8deba9942825eb8f600563a4d314f0340e9a4087 SHA-256: 7da4987594b928df6d71f077f2b0ab313ab428f3fc9aaa4e281b984d1e87dbd7
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. One prominent URL, 'https://trafffi.ru/strik?utm_term=tower+conquest+mod+apk+unlimited+money+and+gems', indicates a lure for a game mod. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafffi.ru/strik?utm_term=tower+conquest+mod+apk+unlimited+money+and+gems PDF link annotation
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/66cf81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fb931050364d.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/dFehb37/best_quotes_for_facebook_dp.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/8808597.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/RU3ww8G/wefidarovaxivon.pdfIn PDF document text
    • https://nalakipivexovob.weebly.com/uploads/1/3/4/3/134385055/wirivizato_pazuza_xotel_worarov.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/hakQXOQ/prison_escape_movies_2019.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/naniz.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/7081838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce36646-bec0-4c83-b10c-f637003d6b02/79151113370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b195c0-7375-4040-bf6b-9a209091fc17/como_se_sintetiza_un_material_elastico_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/uri_the_surgical_strike_trailer_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2dccc0-4a85-4486-8ea5-73afdb52a64f/77127364048.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_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 5724 bytes
SHA-256: 1afd22db2d01aca2b6b91693316b99a9838575968b6b82baa3b583b5bdd9d2f3
font_01_sfnt_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10808 bytes
SHA-256: d408fda93ee6aa3d8989c598488f22a80269253485d89b2e1fb800c0d208fc02