Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7b441ecb7fe42e…

MALICIOUS

PDF

92.9 KB Created: 2021-03-09 05:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00dbe376eabe5ed2ccdc5c8099b6be5c SHA-1: 5c19c46c8c3de5efe23355ce24edbffaa3cfd165 SHA-256: db7b441ecb7fe42ecc4402b8f3b4a26016041649d7db4a506e3351fd9268841a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vilenefex.ru/award?keyword=gametogenesis+in+mammals+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454670/normal_6029fce2810f8.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/9hfFvOz/86862238774.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/viking_sewing_repair_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417980/normal_6004c0e9c27e0.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/9491620b.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/hXiebur/galaxy_watch_3_review_45mm.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/1070004.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/zapit.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/4209573011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_6006b7b12c44a.pdfIn PDF document text
    • https://lasogevedona.weebly.com/uploads/1/3/1/3/131398076/3102228.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/8148279.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/nelefavazuma.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/mejovosorifex-satipilalikidod-difefe-guseridowojurix.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/zorarewig.pdfIn PDF document text
    • https://siviwoxepigomuz.weebly.com/uploads/1/3/0/7/130739754/balupi.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/the_gregorian_calendar_replaced_the_julian_calendar_in_great_britain_in_which_year.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_60388ea7498f8.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/9781095.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/WgfjqH9/my_movies_for_macbook.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/cVvztig/download_ultimate_car_driving_simulator_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/jibjehb/wilogaliwexakojok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wonanikapudidak.atwebpages.com/what_can_you_mix_with_air_in_little_alchemy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25ca855-577a-4b83-9140-f11bf8006856/how_much_does_a_stihl_hedge_trimmer_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f170e98d-262c-41ab-a31b-92cdedc425eb/what_exactly_is_mathematical_analysis_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eced398-4338-4958-aaa2-f16d42685e24/fajamug.pdfIn PDF document text
    • http://domuromu.atwebpages.com/josatozezeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48fc72e-6614-4d97-bfa3-983a5b6accac/gemavubinukeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a2017d-217b-4322-88aa-a82e8b345be0/liftmaster_elite_series_error_code_4-1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 5084 bytes
SHA-256: 61bc18ec6ab816a819147b9d2574ccae53f56f7c6f12f9d213809b9fed0e1e49
font_01_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 10240 bytes
SHA-256: fcf1033e250a4bb7be11c9384a828b5f4054e3e57779106f09373075e3f4415f
font_02_sfnt_off000157dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3