Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5beab7cce71b6ac…

MALICIOUS

PDF

100.7 KB Created: 2021-02-27 08:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21c817b924901b65f0b92f7ebfa90dfe SHA-1: 9cdfeb64e0bfc775e28c99053f6c9c242339fb45 SHA-256: a5beab7cce71b6ac6c3c138ec57197d18c90b178e20701efb2fa520e2584d7b9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/award?keyword=m-audio+keystation+pro+88+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/womawuxinuge/PiSsjht/45769120000.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/H0J6jb6/truck_accessories_for_towing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fc93cb55691f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/jbnxlia/gun_strike_shoot_fire_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_6022cbc807580.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/jji30Ke/loniretodezexadux.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/iznL6ZH/tiny_home_cabins_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/gjslggx/mob_psycho_100_psychic_battle_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/dYNvjbp/messenger_for_whatsapp_web_app_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5ff453be55002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fe8571f70ff4.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/escuelas_contemporaneas_de_la_psicologia.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/16980068251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_6037199780782.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/0hjjdic/ninja_blender_parts_dishwasher_safe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff23e9062c08.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/1s74dIH/movebakerudukumifurub.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/acceleration_practice_problems_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fcccd8794088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5ffac23d5fa81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_6035baec39810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivojeda.atwebpages.com/black_stone_cherry_the_human_condition_gold_vinyl.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/sempertrans_conveyor_belt_catalogue.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_off00014cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB0 5716 bytes
SHA-256: 61e879a21a3c2e083e5366cd765064377917a3f8497a2e1b5aab96fd15557c47
font_01_sfnt_off00015fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE3 10164 bytes
SHA-256: e1a3211b7e5f9f8ad130cce96bd4d8fdae96e8e2175fba6c5f4da86385df136c