Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a9eebf18a3539f…

MALICIOUS

PDF

77.1 KB Created: 2021-02-20 19:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9655351d00caa66c81758f387dd3a43b SHA-1: bee2e2d03f1a5fa72578ceada6d03042d254c58c SHA-256: d9a9eebf18a3539fca1c90e28d4cc0758429bfb53b9fbdc822134b953be9f5a9
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 hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=how+to+win+in+futures+trading PDF link annotation
    • https://cdn.sqhk.co/mebosuxular/DdMjbyr/necromancer_staff_build_gw2.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/9G0hghj/boku_no_hero_academia_amino_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/difgyhh/mods_installer_program.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/i1jftbX/minerva_mcgill_sign_up.pdfIn PDF document text
    • https://cdn.sqhk.co/pomisiforuko/dRijIXv/hi_cooking_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakuzilezozo.epizy.com/zadikufometokitareforipa.pdfIn PDF document text
    • http://wafutevulutud.epizy.com/game_bloons_td_5_for_pc.pdfIn PDF document text
    • http://mujawonevafo.rf.gd/puduxudosuzewo.pdfIn PDF document text
    • http://bukuzagalu.rf.gd/acute_liver_failure_guidelines_2017_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/rezunoxut.pdfIn PDF document text
    • http://lizuratudesaxop.epizy.com/engagement_letter_audit_template.pdfIn PDF document text
    • http://regujivabi.rf.gd/android_auto_whatsapp_notifications.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/watowir.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/baahubali_2_tamil_movie_free_tamilyogi.pdfIn PDF document text
    • http://wonetone.rf.gd/54826292632.pdfIn PDF document text
    • http://finimuzodorum.rf.gd/rama_judicial_consulta_de_procesos_ejecucin_de_penas_por_cdula.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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 5096 bytes
SHA-256: 3b0f738d591bbf834c80c0d17c53517304c81d7ee73a4ca907fbe84b85f2969a
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10700 bytes
SHA-256: c8ba812772d406dd5b3b684b6758d6e1b1c79bf33652488e795f5b988a4782ad

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