Malicious PDF — malware analysis report

Static analysis result for SHA-256 046376cf288de3cf…

MALICIOUS

PDF

81.5 KB Created: 2021-04-01 15:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 636906a0237c2adc2d8e485210bdb9a9 SHA-1: b04dc24e88ab04d5c29e542a9d18f81a79e71f3c SHA-256: 046376cf288de3cfd928a0895a41c4b653f03d67f1ba0da00431b35cbdb9a8cc
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. One notable URL, 'https://pelibifir.ru/strik?utm_term=how+to+train+for+rock+climbing', is directly associated with a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://pelibifir.ru/strik?utm_term=how+to+train+for+rock+climbing
    • https://cdn-cms.f-static.net/uploads/4368468/normal_605db8fe80592.pdf
    • https://cdn-cms.f-static.net/uploads/4500889/normal_6055330545b62.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_60138698913e8.pdf
    • http://fitnesspack.net/nilunavopotuvejegewipovamrwdd6.pdf
    • http://help-lnstagramcopyrights-verify.com/watenlu14v.pdf
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5fce58f829a99.pdf
    • http://kozevajalun.22web.org/rugby_bulking_up_program.pdf
    • http://losinglotterynumbers.com/farkle_minkus_age16tly.pdf
    • http://megantv.site/guided_reading_lesson_plans_for_chapter_books7lm92.pdf
    • http://xixabibalusuzip.22web.org/migepata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dolufin.epizy.com/nesidawaminer.pdf
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_241cbfff05b94cbd909231e51e1142f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81ac82e9-30ee-4aa7-a029-676fc2a8b885/how_to_increase_a_shape_by_a_scale_factor.pdf
    • https://s3.amazonaws.com/setigafat/android_symbol_appearing.pdf
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_064eeaaf52d7499dbad82b8310de3f10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e079831-7338-44b9-96dd-90cd457c9437/nakewovotisovesul.pdf
    • https://s3.amazonaws.com/xofalepelala/autocad_dwf_viewer_free_mac.pdf
    • https://uploads.strikinglycdn.com/files/91991202-0321-4d37-a880-6dd0a465ecb0/98958254462.pdf
    • https://uploads.strikinglycdn.com/files/d078dabf-e77d-4279-b81b-ba4a11c8b535/matadokowud.pdf
    • https://uploads.strikinglycdn.com/files/146e22fc-d725-4b9f-9d1c-0688b1c0be2c/hp_laserjet_p3015_printer_51.10_error.pdf
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_b7fb58f4957d4016b0a187363a7808b4.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f441.bin
7007768be3fda5f2d04e68392acb7b25cf7d9ad16de85692ce0e1fdeedb014e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 4948 bytes
font_01_sfnt_off00010507.bin
ec26ccd62c927bd8df160aba42cfd5de7501bb82954158567bf6803a2eab0802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10580 bytes
font_02_sfnt_off000128ed.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 4324 bytes

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