Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d2e5994e12e900…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 23:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c2c7f76649846a2e52b7ee9dc3e7eb8f SHA-1: ec2ee1daad7591f8b929d8cb3bb5691bbe73a370 SHA-256: a1d2e5994e12e900622c66d89d6c5c311c3760129dd7e5a01414bce8c1f3e6d4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary focus on directing users to `bologen.ru`. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool often used to create PDF documents from web content, further supporting the lure of free programs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=programmi+storyboard+free PDF link annotation
    • http://zopokujejisolan.getenjoyment.net/cambridge_checkpoint_english_student_book_2_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5fed1c9b80292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fe78cf371d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_604b120a98d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_602237359f72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_600f924cb1cf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_600171403471c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_6015dc99a88a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_600de45c0a811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_603aa7fdea4e3.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/what_was_radical_about_congressional_reconstruction.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/lanipu.pdfIn PDF document text
    • http://fogarapisow.22web.org/granado_espada_characters_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6040dc94215a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_603a59a4e596b.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/2020_afl_fixture_a4.pdfIn PDF document text
    • http://dupipavigojas.iblogger.org/64088087822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_6016abdb1b479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevakop.epizy.com/fuvumuviwijasarodib.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/scratch_app_apk.pdfIn PDF document text
    • http://jonufinufezo.epizy.com/traductor_de_ingles_a_espaol_google_play_store.pdfIn PDF document text
    • http://misezofet.epizy.com/wobasevepudoju.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/nespresso_aeroccino3_milk_frother_blinking_red_light.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/pak_studies_9th_class_chapter_5_notes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 5436 bytes
SHA-256: 1fd32febf4b2b2901e8dbdd47bb3e50580bac5d80814554ad3f176977d92d2fe
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 11308 bytes
SHA-256: 6fca5c89f67a917c7c995a52ad27a81bc30ea74a93d10e5191c41436265c965b

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