Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a5e8a21605f894…

MALICIOUS

PDF

80.7 KB Created: 2021-03-10 15:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bec97b7ec3aeded36a3661ee73f7a484 SHA-1: 51f8387ae8ffe8f9af251a4c183bb394e3aaf75b SHA-256: 67a5e8a21605f8944e92501e7c11533d1a1031fc4791352f614d0423a2443b24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://golowaki.ru/123?utm_term=nintendo+3ds+emulator+apk+aptoide PDF link annotation
    • https://cdn.sqhk.co/gesokusa/j7jhjas/tournament_organizer_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_60212bd58157c.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/5387679275.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/hp_printer_p2035n_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/dhjigKc/basonene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fdd3c0fd86a6.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/33310984628.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/98357592921.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/what_my_default_router_ip_address.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff6594c73d04.pdfIn PDF document text
    • https://cdn.sqhk.co/zegapoxasut/gcsN2Qp/driving_school_sim_2020_hack_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fc5db898b1b4.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/zitumebun.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/49626251561.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jcbgeig/tiktok_stock_code.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/much_ado_about_nothing_character_analysis_claudio.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/djhjajg/dead_colony_pro_version_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499282/normal_5ff1c7f741a2a.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxilumevo/jDTa2bD/lausanne_2020_hockey.pdfIn PDF document text
    • https://cdn.sqhk.co/develezuwa/igpJaI5/samsung_clp-_310_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/NjdiccO/ninja_flip_up_air_fryer_recipes.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/80d066d3-8709-49ab-86ee-e8f0b3d8f6cb/kozagekobovizetofezizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f0e10f-ecd6-4fe9-89aa-2cb04a60c05b/linear_algebra_4th_edition_slader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc24fbf-6f01-4636-a402-abe70b0ffc86/fifty_shades_of_grey_trilogy_ebook_free_download_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d221297b-bb93-4729-9be2-82d3e723a144/53179568288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef578dc5-8cce-4e24-b969-e95b97fe98dc/1323856787.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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5300 bytes
SHA-256: d996fc3e9aa47e84ed09e5c9ac190c3723c975b9f65a44a41d3138bfb5e2e8b2
font_01_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 14844 bytes
SHA-256: 2329fb2a30496f618f856b67fc7e8989d2d99830dfce94cc9348d09795f30c67