Malicious PDF — malware analysis report

Static analysis result for SHA-256 1333a9da7864aee6…

MALICIOUS

PDF

98.0 KB Created: 2021-03-15 11:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 49adbcb2dfb114dce73f635f0d2a3458 SHA-1: 217a9e9a8480bcdca0af2031fa527b8fcfc3d19a SHA-256: 1333a9da7864aee69c13e9e0e1fcd65d8e028d46b6155f80d6c1e7d6b90c021f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://bologen.ru/strik?utm_term=the+way+of+perfection+teresa+of+avila', are likely used to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=the+way+of+perfection+teresa+of+avila PDF link annotation
    • https://cdn.sqhk.co/serodozire/ie0Jzid/58657179390.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/19422863237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_60426e7c24f9c.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/the_phases_of_the_moon_whats_going_on_worksheet.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/annual_book_astm_standards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6041b41d2c126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_601f931326750.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/2000_jeep_grand_cherokee_check_engine_light_on_but_no_codes.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/cell_culture_techniques.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/gcLcf8M/download_game_hit_and_knockdown_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketabigumowun.atwebpages.com/romeo_and_juliet_act_2.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_acaff97223b04267af2b1f20861cf2f0.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_41c55f951e504b6abcd34115fdccc285.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27bea9ad-e758-4593-aa01-67ca22920642/97921219091.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_e285e09ce5a743a8b7da6d0b84439935.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_d0f18d51e771431fbc1a29ed7c06f06e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/021fe8c4-c9b6-4ec3-aba8-3ee5beaeaead/ap_style_percent_sign_or_word.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/24298802726.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/kobisapotaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b514bbfd-b0ef-4955-a0fb-b78a3ae55eea/how_to_put_pad_on_swiffer_wetjet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d33883-f449-4c42-8348-01c59125ca78/79028668974.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_off00013f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F90 5304 bytes
SHA-256: 0ca026adce9136184ba83672c468c1de64c9a909651275767e85c3976d4bf5a7
font_01_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 11684 bytes
SHA-256: 3e6519200f2dd2073a00d0e401a7ae7de34d228b114e4960c8083b8391af5297

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