Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b16cc92efbdb34…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 10:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 66afd9ac580634457b236c67320352f0 SHA-1: 8a9867d603cf0c8805a7acc0588ce09b6344264e SHA-256: 36b16cc92efbdb3409c276a86499fe6f64fed52e05dde9df60333305f4debb48
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

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://pelibifir.ru/strik?utm_term=paul+eluard+libert%25C3%25A9+texte PDF link annotation
    • https://cdn.sqhk.co/letaziseb/jfheYT6/infection_control_jobs_san_antonio.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/xuzoma.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/hbiagds/scorpion_mortal_kombat_11_wallpaper_hd.pdfIn PDF document text
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/8228838.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/71456961470.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/what_is_a_level_1_leader.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/tipos_de_comunicacion_no_verbal_kinesica_proxemica_paralinguistica.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/schwinn_270_recumbent_bike_console_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/ihuMfeE/nufopimuwukoxerifok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_6015114a8d371.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/njhZrGQ/police_vs_zombies_download_full_version_free.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/primeros_auxilios_definicion_segun_la_oms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_600f7636076a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_600db10ba588a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/red_a_crayons_story_worksheet.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/metal_gear_solid_2_pc_trainer.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/resibokifoba.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_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 4992 bytes
SHA-256: aaabdde0cfe691a0526d56abda99b32383f78ca44c2a9e502e5e5d66047ab864
font_01_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 12292 bytes
SHA-256: fdfa13738055aa9c3c4b21fe25412c5079e0258ff9dbef3c951928d68692f254

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