Malicious PDF — malware analysis report

Static analysis result for SHA-256 29765d663c6e47b2…

MALICIOUS

PDF

79.6 KB Created: 2021-04-22 00:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 135f04268db936963b9aa5b70b5748af SHA-1: b1e2e49f129d548378c8e3cd272544d519b163ce SHA-256: 29765d663c6e47b2340635091022c3ac75feedfc3cd657aeb7227cd8bc2ba7af
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 domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=odd+thomas+movie+actors PDF link annotation
    • http://tk-time.site/gajolebidwxabm.pdfIn PDF document text
    • http://tryadasert.online/94533172098irx75.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/area_of_circle_questions.pdfIn PDF document text
    • http://damita.fun/high_school_geometry_worksheetsnfo4r.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/af735c892398.pdfIn PDF document text
    • http://lojasamericanasbr.com/how_to_install_a_harbor_breeze_universal_ceiling_fan_remote_control8n0nm.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/saifurs_ielts_reading_book.pdfIn PDF document text
    • https://biresunidulili.weebly.com/uploads/1/3/1/8/131856549/53d2e0b0c6d.pdfIn PDF document text
    • http://repochka.site/tecnicas_de_redaccion_parrafo_ejemplo42er4.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/fuzedixadizabo.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/makajubobomof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebagakid.onlinewebshop.net/brownie_household_elf_badge.pdfIn PDF document text
    • http://mowixir.epizy.com/macroeconomics_7th_edition_by_olivier_blanchard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8437df7-c997-45be-9adb-2da68cd4b9d3/did_country_shut_down_for_spanish_flu.pdfIn PDF document text
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_10daf3c054b9453aac64657f46fbed13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7911a2-19c8-4e82-b7dd-dc5c3323c6cd/hp_officejet_h470_ink_cartridge_reset.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_b0f08bd49884466b9dc1fb6f8debc598.pdf?index=trueIn PDF document text
    • http://lawupoxag.epizy.com/resistivity_and_sheet_resistance.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/are_chevy_camaros_expensive_to_maintain.pdfIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_95a26d9d7bf7400387ea605f6dedf712.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_eb8e9c0c3cf343ea9ca27377fbd78172.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca810115-c259-4551-8bf8-7161a574824e/zozuje.pdfIn PDF document text
    • http://situwosase.myartsonline.com/introduction_phonetics_and_phonology.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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5236 bytes
SHA-256: 7eeb7aa31755464c1a33a2b58bdc59b859ee9e7c1e730d0a4e9ebf7f3bda8689
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 11892 bytes
SHA-256: 1d6c18cbaea8d43f1e45b7b636e0f7db9ce83744560657975f38a466d00e5d8e