Malicious PDF — malware analysis report

Static analysis result for SHA-256 f874e07ad79bbbd7…

MALICIOUS

PDF

86.8 KB Created: 2021-03-04 08:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a5f4114427b639279cf4ef3f2dd9f79b SHA-1: 921e9e7e4f4d5d36d00a2e69611628d98b7dd189 SHA-256: f874e07ad79bbbd79c9e67fdc16f8e2255b54df3870b361b1e0c5d4d4f16f4c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a phishing domain disguised as a Google contest. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and URL analysis suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=google+logo+design+contest+2020 PDF link annotation
    • http://gefosezidubajoz.scienceontheweb.net/my_cloud_ex2_ultra_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/tFegjVP/artificial_intelligence_companies_to_invest_in_uk.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/a_static_budget_is_appropriate_for.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/jfhhjez/match_land_puzzle_rpg_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/ghigia7/steam_cleaner_rental_walmart_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/bihhem4/27575700920.pdfIn PDF document text
    • http://momentikshop.space/nurabamofoxipabegixusvfguk.pdfIn PDF document text
    • http://bigakeka.iblogger.org/fudawugidap.pdfIn PDF document text
    • http://ottics.ru/banned_books_list5qari.pdfIn PDF document text
    • http://naturalm.space/bibetiduuoyox.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/how_much_does_a_12_foot_trampoline_cost.pdfIn PDF document text
    • http://avto-document.site/ginonajoxutw883.pdfIn PDF document text
    • http://malespw.xyz/36230033300o1qxf.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hgm6d5A/cardiac_arrhythmias_interpretation_diagnosis_and_treatment.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://sazasewugekupej.onlinewebshop.net/jatotazibobeb.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/devevem.pdfIn PDF document text
    • http://ralavokapijalig.rf.gd/15368167791.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 4892 bytes
SHA-256: 3e4c9df6bff771b4e4dd749188b6b5746b4482ec52a33150fc02d1f137502fc6
font_01_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 10868 bytes
SHA-256: 4d7a69100c6f5410ab2d4344fc45c689a14f7af0f32ac932b6788d6338f07eb9
font_02_sfnt_off00013faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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