Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ceeeb45263e906…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 15:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4cf7d0eb98449e3d52893c92466bd41 SHA-1: 193780e4074e0a158f2278cd24aa26f3d576c5a6 SHA-256: 27ceeeb45263e906b7d0f174a53d51583404b3a05192a7ed9b4e28ca0ba337da
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=arsenal+vs+chelsea+europa+final+highlight
    • http://microdigitalmeter.xyz/what_types_of_relationships_do_prepositions_showawqo9.pdf
    • http://kunujunekedi.mygamesonline.org/nortel_norstar_plus_compact_ics_phone_system_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fc7ffcb9fe44.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/lefiwijukuzo-lozigobe-retoteg-kiliji.pdf
    • http://pewujok.mypressonline.com/al_fajr_watch_user_manual.pdf
    • http://lerimofo.mywebcommunity.org/47013275657.pdf
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5ffde54fd558a.pdf
    • http://future-techno.ru/dragon_magazine_compendium_volume_1aef04.pdf
    • http://sitebomobegux.sportsontheweb.net/81061513514.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_602413fdd88a5.pdf
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/texazijezi.pdf
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/sijejabogaxisef_difunamez_fabutujeko.pdf
    • https://cdn-cms.f-static.net/uploads/4501360/normal_600f475820f58.pdf
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/d2c08fbcb.pdf
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5feb9c76ee1a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizijubovapuk/after_effects_movie_title_templates.pdf
    • https://s3.amazonaws.com/figugipopar/xuputeluzeneb.pdf
    • https://s3.amazonaws.com/liluvad/25925297860.pdf
    • https://s3.amazonaws.com/zemunomipazikez/char-_broil_performance_seriestm_220b.pdf
    • http://giworutiw.myartsonline.com/68674786163.pdf
    • https://s3.amazonaws.com/bepukuba/2018_jeep_wrangler_jk_owners_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef03.bin
f0a015b7f13db8f8e3b495335e8e06cea01709898c738040dedd0d0a04ad7501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5328 bytes
font_01_sfnt_off00010125.bin
e309f7506c7c3aeabebb6d915cde246c169e423705d8986e5ebaf8944f03e316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 13268 bytes
font_02_sfnt_off00012976.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16036 bytes

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