Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e75d30d2d5d549…

MALICIOUS

PDF

81.7 KB Created: 2021-06-03 09:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73f787f1be47aade63d676c40de3fa3c SHA-1: d54be9d070609e1eb90bb15254a09d49d80fdcab SHA-256: 28e75d30d2d5d549e0a8a67e275e8217f6f7cb5c591e3598ab18cad3050eeb4a
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'infrive.ru', which is highly suspicious. The ClamAV detection and ML classifier also strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to present a lure. The primary attack pattern is phishing via a malicious attachment, directing the user to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/pbw?utm_term=gta+san+andreas+vorbisfile+hooked+dll
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fddafd353733.pdf
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/2575181.pdf
    • https://static.s123-cdn-static.com/uploads/4388060/normal_5fcb14ac698b8.pdf
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ff652d7ba1a7.pdf
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/91c39abb1942.pdf
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5ff0ceb753914.pdf
    • https://nabutamu.weebly.com/uploads/1/3/4/5/134525390/a008a4cb9fd1e86.pdf
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603ad3b7295f3.pdf
    • https://wojazaxu.weebly.com/uploads/1/3/4/5/134589930/piruzosifelozibenav.pdf
    • https://labivorimafixal.weebly.com/uploads/1/3/4/8/134886738/9457581.pdf
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/80794.pdf
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5fe20ac8bf6e6.pdf
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fe6e9bd6c957.pdf
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/6150497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rimikupababo.pbworks.com/f/where_is_my_mind_drum_sheet_music.pdf
    • http://bovozajezo.pbworks.com/w/file/fetch/144472626/86616310619.pdf
    • https://uploads.strikinglycdn.com/files/02da8fb4-5dbb-4056-bd0f-bfb1c5d2f095/10581848068.pdf
    • http://xelivolofuso.pbworks.com/w/file/fetch/144547794/como_tomar_ciprofloxacino_para_infeco_urinria.pdf
    • http://rimikupababo.pbworks.com/w/file/fetch/144534741/75227345682.pdf
    • http://tebejeloxid.pbworks.com/w/file/fetch/144424002/55442662685.pdf
    • https://uploads.strikinglycdn.com/files/87e61fa3-7872-4d15-8d5f-8a472af2f831/why_is_my_canon_not_printing.pdf
    • https://uploads.strikinglycdn.com/files/b9ca23dd-2646-4e49-8814-19db56ec6932/86488479188.pdf
    • https://uploads.strikinglycdn.com/files/818ba842-f923-4a48-9445-02a0ca512727/forager_frozen_galaxy_puzzle.pdf
    • https://uploads.strikinglycdn.com/files/7195f718-0906-4752-9346-3f65cd0a34a2/cementerio_de_animales_stephen_king_sinopsis.pdf
    • 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_off0000ed99.bin
7d304f606f3641bb95db2a88bb13c39321f44f146685928ccacf0b0ffebbbf90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5080 bytes
font_01_sfnt_off0000feda.bin
f0dde6d97aae20de3c52810cf7c037633a9d2050e5ea39dd604e2607414b7058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 14020 bytes
font_02_sfnt_off00012b40.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 4324 bytes

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