Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b05da21a263ca5…

MALICIOUS

PDF

86.8 KB Created: 2021-03-23 09:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ea6f221f5b396296a10afa501a4b12da SHA-1: 3dbba558898fafb79cbaec4c44a4dd94ee40ddc1 SHA-256: 05b05da21a263ca563b4d4c7d50019fcb8bfc2d929a59e7bc335ca6e411f4636
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://bologen.ru/award?keyword=arteria+carotida+anatomia+pdf', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/award?keyword=arteria+carotida+anatomia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476767/normal_6039ace67457c.pdfIn PDF document text
    • http://bestplacefor.rest/how_to_find_the_velocity_of_a_ball_when_it_hits_the_ground_calculusadkv5.pdfIn PDF document text
    • http://alania365.ru/63597448816xur8u.pdfIn PDF document text
    • http://podipotekoi.ru/64995265643mc61v.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/ggIEBjc/phone_application_ringtones.pdfIn PDF document text
    • http://autobaff.xyz/happy_oasis_semaphore7flcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fd15e7f4bd2b.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/MkjhrUj/wiwufoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/jhoXqxW/zivorofiv.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/Ck7ifTM/vesimalevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390385/normal_5ffe97771f16a.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/qB0wNhf/delta_blues_music_definition.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
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_34a8b301276b4f8f8c904296f5f39d60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/batman_mystery_of_batwoman_movie.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_cd9510965045433a822f5c1b3833ad0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafirawit/dunezonotuj.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_6eff14b645164fc4923d6adcc7146b0a.pdf?index=trueIn PDF document text
    • http://nejegidijikoj.epizy.com/schubert_liszt_standchen_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/asap_rocky_all_songs.pdfIn PDF document text
    • http://vedudide.rf.gd/badez.pdfIn PDF document text
    • http://kowifojabar.rf.gd/audio_technica_lp120xbt_manual.pdfIn PDF document text
    • http://nopizimexid.rf.gd/ritakobo.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_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 4868 bytes
SHA-256: 55cd486676ca62a888c3225f9c2e570e8448d58650959d2d1d6199dc0fc5e14f
font_01_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 11496 bytes
SHA-256: 1a1b9adf2c4a51b1342e8fe46fcbbca0ca444b1149598caa968a5317b70e28d1
font_02_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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