Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcf898b9d26fcb8…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 02:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c848ecd636fff76f7c97a4ca0af07b SHA-1: 754831c7d47d2ef47ba42135181976e640a67608 SHA-256: ffcf898b9d26fcb853939e99dde61fbaaf94834662c2b203b4a46297bee03bf6
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The embedded URL points to a domain that appears to be part of a lure for downloading a PDF, likely containing further malicious content or redirecting to a phishing site. The document body, though heavily obfuscated, contains references to 'jquery ajax post download pdf' and the authoring application 'wkhtmltopdf', suggesting a crafted document intended to trick users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=jquery+ajax+post+download+pdf
    • https://cdn.sqhk.co/webepinovet/jvDhcii/fuwarapumido.pdf
    • https://cdn.sqhk.co/fumodolanes/OhagMjc/building_construction_illustrated_dk_ching.pdf
    • https://cdn-cms.f-static.net/uploads/4459060/normal_604320e7c6a9c.pdf
    • http://prizinsta.online/89130814519tp3na.pdf
    • http://fitness1.space/best_volume_booster_appww7w3.pdf
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fc9d71059d90.pdf
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fe6a153c23fb.pdf
    • https://cdn.sqhk.co/terasovo/lchjpjc/chip_and_dale_video_game.pdf
    • https://cdn.sqhk.co/bimolixumotu/duSjiED/when_are_asda_christmas_slots_available_2020.pdf
    • http://kixiwogazu.sportsontheweb.net/farifekekatupebiri.pdf
    • https://cdn-cms.f-static.net/uploads/4481286/normal_6039c06b756ed.pdf
    • http://heliusdesign.ru/444839853415l8rj.pdf
    • https://cdn.sqhk.co/lemisobe/hfhd50h/93276014743.pdf
    • https://cdn-cms.f-static.net/uploads/4403936/normal_60268ffbf1f49.pdf
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5ff26aba2e27f.pdf
    • https://static.s123-cdn-static.com/uploads/4367665/normal_5ffda8501222b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lolaritemukole/free_printable_consonant_blends_worksheets_for_kindergarten.pdf
    • http://zapusov.atwebpages.com/37265076699.pdf
    • https://s3.amazonaws.com/sixolose/interpreting_p_l_financial_reports.pdf
    • https://s3.amazonaws.com/rogugagatuf/21946432196.pdf
    • https://s3.amazonaws.com/kuboki/human_body_template_male.pdf
    • https://s3.amazonaws.com/benuka/baking_sheet_with_wire_rack_insert.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d5.bin
1df88a773bf5c3232b895113107c5886a93f7e8cd4f42628e3f7f4819852e016
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 5488 bytes
font_01_sfnt_off0000fcb5.bin
9af4337c5f7b0c27638163d3c4abd77a5a5eb994af0e2c82fe5c2aa670331291
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 11236 bytes