Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a04b6e203162ae…

MALICIOUS

PDF

82.0 KB Created: 2021-03-28 09:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5a7cb798898f41e56acf38d0990f6bf1 SHA-1: 9322a7179d0c70903dcd55c80809836481e705c7 SHA-256: 36a04b6e203162ae8afddc48182fd7bf0b253373fa18f5c480252fec17c8480a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, and one heuristic specifically identifies it as a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=abu+shuja+english+pdf PDF link annotation
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/9302575.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwuzasemifo/khvCbih/the_bounce_back_movie_free_download.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/45149065153.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/8hhrDhi/38632749725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_602454547eafb.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/493807.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/vovubuvozi.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/h8hgieN/sudowapagigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd638cd77225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fd7cd7acdeda.pdfIn PDF document text
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/09b6674c12200d0.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/jdDijia/46055456421.pdfIn PDF document text
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/604d17fc1.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/bengali_to_english_translation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6ac65e-1319-4e12-9149-7c81a6c0f6f1/how_to_use_farberware_nutrimaster_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65692eb-8d88-4e51-bd96-bb2dcefa2708/punuzowekodeb.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/bottines_plateforme_lacets_talon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a118b90f-ad9c-46e8-993b-45def3dfb5d6/83561748250.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/pancharatra_agama_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/77620147235.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/how_to_use_fx-100ms_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/26200933152.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/how_to_learn_about_forex_currency_trading.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000118e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118E7 19924 bytes
SHA-256: 6ffc10fb9aeef74db567c52b6e5a0cad421207c136cde24b60fe94cd21abdc28
font_00_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5412 bytes
SHA-256: 808d84c547202f6d1c35663bf5974d6c0e6599993f3539ed8d2b848227277559
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 12288 bytes
SHA-256: d8a0b1acc096a3d90838f8b3bd80e661a4c739b027fcf824cf6aedaab138cf3d