Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c90b2e878c85be…

MALICIOUS

PDF

79.8 KB Created: 2021-03-15 03:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eeac8fa88f96567f274746d5db56481e SHA-1: 5b26b1374b12c368ce4a027f36ba10154ba5ebeb SHA-256: 63c90b2e878c85be7409680766555a6e913759d6e8ec154a521fcc1552be6af9
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 0.9997

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://kuzutuzo.ru/wix?keyword=primus+iq+brake+controller+installation PDF link annotation
    • http://nuloriwilorij.scienceontheweb.net/purisomedolepopatu.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/silas_marner_oxford_bookworms.pdfIn PDF document text
    • http://sibuvre.com/pittsburgh_police_department_zone_4_station_pittsburgh_pa7rcds.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/hrja8ja/zafetowox.pdfIn PDF document text
    • https://cdn.sqhk.co/melobokodijo/giUigN5/esge_guidelines_gallstones.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/oieqfgi/fodijalopal.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/blood_bowl_2020_rosters.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/Eihidjg/drop_ball_blast_virus_warframe.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/38937866473.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/gevxhhg/blockly_maze_level_9.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/85540339722.pdfIn PDF document text
    • http://rankingcoach-apps.com/363554215575xyhk.pdfIn PDF document text
    • https://cdn.sqhk.co/vugiboba/Rgggihg/13419162092.pdfIn PDF document text
    • http://options.expert/somebody_blew_up_americaufhky.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/craftsman_13_planer_parts.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/robin_hood_2010_movie_review.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://pifimopumo.rf.gd/warhammer_40000_8th_edition_rulebook.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/39687525461.pdfIn PDF document text
    • http://saziwujezad.epizy.com/48925052913.pdfIn PDF document text
    • http://nebojemesiwi.atwebpages.com/kokepunomadakemi.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_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 5160 bytes
SHA-256: daa38712622504b9274b6691ca8c961c3b99491d0f4b0a95c0edcac9a028fc60
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 10416 bytes
SHA-256: c5b9943a2c1993b199a3e4dec57ca97745abe4e408cb448695f1911d772be4da
font_02_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34