Malicious PDF — malware analysis report

Static analysis result for SHA-256 f912f8058130f8bd…

MALICIOUS

PDF

80.5 KB Created: 2021-02-21 04:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a5a95f780d7d60b42165756bc81389ef SHA-1: 96d5703d45003dcd8924bcf212dc21f3f796e74a SHA-256: f912f8058130f8bdaf9b03f5445bc2b9f0cc821fd59df5f99b73554e9bf5afc4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a tactic of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme.

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://maypoin.ru/wix?keyword=ms+cooper+central+park+video PDF link annotation
    • http://lnstagram-help-businesss.com/bibefexapaxuxevd0qd6.pdfIn PDF document text
    • http://presalle.xyz/the_gnostic_bible_the_pistis_sophia_unveiledrol5d.pdfIn PDF document text
    • http://idclick.cash/170635083581imcy.pdfIn PDF document text
    • http://ens-pictures.ru/yellow_belly_slider_care_sheet7g4qb.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/uw2tDid/download_idle_harbor_tycoon_mod_apk.pdfIn PDF document text
    • http://wdd13.ru/vixuwoufka6.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/fhIHhd2/sitting_room_chair_designs_in_nigeria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fd1ab179ec2c.pdfIn PDF document text
    • http://autobuff.xyz/guitar_sheet_music_tab_converteruloie.pdfIn PDF document text
    • http://mon-cmbretagne.com/deadpool_comics_in_ordersx67r.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/dge0ggT/joxeluvusegepawinefid.pdfIn PDF document text
    • http://inmyshtangen.xyz/bowflex_power_pro_xtl_home_gym_manualju0ne.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ibKhbmD/world_war_polygon_shooting_game_modern_war_games.pdfIn PDF document text
    • http://vseti.life/aac_file_format_stack_overflow5mo6m.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/E9hgSEv/pedotaxufoxifuxufik.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://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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 4984 bytes
SHA-256: 628af64b88f968b6aa930051bf33fb9ce2397ddd5cff3c1d84db3833f43af0a9
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 10684 bytes
SHA-256: 67a11384b2dbda87bec0ceec25bf0f6d4c8cebf0f753d0187493990b90d173a7
font_02_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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