Malicious PDF — malware analysis report

Static analysis result for SHA-256 076e24f0505cf24f…

MALICIOUS

PDF

72.9 KB Created: 2021-04-27 21:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31a10e90cda6dee9c7060db529e787e0 SHA-1: 6989aea9e98ed251e8a5b1d88a82e8e88906dee6 SHA-256: 076e24f0505cf24fd54f19fdea64b2c76dddec4ca0c6712a542a9b6fcecb2cee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=1984+quiz+chapters+1-3 PDF link annotation
    • http://vitrinachel.ru/problemas_de_porcentajes_6o_primaria_resueltost4mr7.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/que_es_la_musica_contemporanea.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/jfPhiih/classroom_management_definition_by_authors.pdfIn PDF document text
    • http://uscreditinquiry.info/bawasavokug0nant.pdfIn PDF document text
    • http://milky-rp.space/buzzer_beater_basketball_playswcd9u.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/ataxia_cerebelar_fisiopatologia.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/noxosuxezosesixp07fo.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/72461839558.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/ealljjF/amazeum_bentonville_staff.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/fXma20o/33440912982.pdfIn PDF document text
    • http://baltika-trans.ru/khachaturian_piano_concerto19dxo.pdfIn PDF document text
    • http://tameeniraq.com/2012_jeep_grand_cherokee_brake_light_bulbho8n5.pdfIn PDF document text
    • http://kodavuviguwu.mypressonline.com/56227182304.pdfIn PDF document text
    • http://medicalpracticementor.com/problem_solving_activities_for_elementary_studentspm11b.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/bf5iht3/16660637611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sopexalibip.onlinewebshop.net/aashto_lrfd_bridge_design_specifications_free_download.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_cf1b3f38d6bb402c803e7ce90fb19972.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_e7ae0a5c7fe44bdea42161bdeaa6b990.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_3e499684484f410e969bfdbfc36281fe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 5756 bytes
SHA-256: 057eed24c8c6ce67f19dbe32e9826ff55c842e6c5d6a3736c8be6f6e074e945e
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10836 bytes
SHA-256: f5d1e3b7d3391387043b3e1adc134ae2724940aba5852388a19d04e81aca4131

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