Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c19c10173b68432…

MALICIOUS

PDF

71.0 KB Created: 2021-03-09 01:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9a59a3cdc7232b9d64eb4d7023702e8 SHA-1: 974729debd88ec6c2e496b9ccbb46a74552ad001 SHA-256: 6c19c10173b684329e89d80d1d34a7a4dfc190b735a0905f3abd707965aa6c81
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to book downloads, reinforcing the lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=administracion+de+recursos+humanos+bohlander+17+edicion+pdf+descargar PDF link annotation
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/16f2a58c.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/j2hbPCi/rc_carpet_tracks_near_me.pdfIn PDF document text
    • http://tezatigobupuvu.22web.org/sol_b._com_syllabus_2017.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/dijupixataki.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/6424383.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/UjcWtgh/kafanajiki.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/hcsieDN/pifuxuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/hcdohhG/4x4_suv_off_road_extreme_jeep_game_simulasi.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/ObGegdT/jobmania_eternal_dungeon_redeem_code.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/1a82503f6ee478f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6272b7e-2ca1-472c-96fa-89e4800e561a/pizowedunanisuxigomekefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e905c2-0492-4c3e-9ceb-823499030543/what_is_a_good_workout_at_planet_fitness.pdfIn PDF document text
    • http://mepumubim.rf.gd/aankhon_aankhon_ne_fasa_liya_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab8cfc8-6f6a-4011-b4c0-a73d9386393c/ropexubume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234b42c9-b91c-4f4e-99c2-80686b5f319f/anker_keyboard_bluetooth_pairing.pdfIn PDF document text
    • http://zoweratizid.epizy.com/clinical_laboratory_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2183a36-4eec-4281-9da6-17b94ae08fee/noma_snow_thrower_manual.pdfIn PDF document text
    • http://sebuxorowadedo.rf.gd/v_for_vendetta_why_does_he_wear_a_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9707b1-f660-4f4a-9853-a52d1078e749/rebuxorizuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44203a4c-7952-462b-9847-a62c402a790b/87704587156.pdfIn PDF document text
    • http://zepukedosapiw.rf.gd/how_to_adjust_desktop_picture_size_on_mac.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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 5832 bytes
SHA-256: 8bff909fbb523a6578425babb282bebf34abf2cb66767aa822255dbd7df32c27
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 10844 bytes
SHA-256: 268e445925de13b22cf42249266c969397358507a71ad14245294e8f8eedfd24