Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e39e3f905a1117…

MALICIOUS

PDF

74.5 KB Created: 2021-02-14 16:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: af4d8b3c4f25609b5092bd22fad407bb SHA-1: 63a40e7e1c21b0813d86e455c0a79b88bd3fe51a SHA-256: c7e39e3f905a11173acb53b1c12bf52a9b62b3f5ef79f74312f227b7e01e1ecd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

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://maypoin.ru/aws?utm_term=betalactamicos+farmacos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60209c0d84924.pdfIn PDF document text
    • http://creditstar-kabinet.com/kadimazavsnna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_60122c6c67454.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/igjiAjd/alchemy_game_combos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_602647229bff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fdb87c78d53b.pdfIn PDF document text
    • http://hiziryigit.online/gta_5_ufo_parts_mapacrxr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5fcd3c389fc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_60204058b3723.pdfIn PDF document text
    • http://purpless.vip/fosanisoigq5.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/jheidKg/download_street_racing_3d_mod_apk_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_600704b3ded7b.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/vYkjhic/band_pass_filter_circuit_on_breadboard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopuviboxew.rf.gd/xifakojalanesojurofadul.pdfIn PDF document text
    • http://zorenepovapaj.epizy.com/bavofawugawupunanogi.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5348 bytes
SHA-256: 27bab9288e9b5ad03f6367229f6c5c55b1232508e7837a9fc3456d045678cff1
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 11228 bytes
SHA-256: f9fe3a3621d7a4167dbae926d594796e77a03985c1a73e6c8aad893cb66a0f48

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