Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe0c53175b6f553…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 05:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95a833296f5f29e36fc780fdde18897a SHA-1: 7bda29651aadbf196c446b1ee19db023c70cb08d SHA-256: 4fe0c53175b6f5534d41760e229c9bb88735f1be09b0a84345be6ba867f769a8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=catawba+county+gis+reports
    • http://ronifibofizet.medianewsonline.com/tapanixinesigipirarizag.pdf
    • http://gtmedis.com/what_is_a_classroom_management_plan_definitionfa27l.pdf
    • https://cdn.sqhk.co/dusawugivepo/hir6xWw/best_bedwars_maps_hypixel.pdf
    • http://wugumonisukanib.sportsontheweb.net/office_administrator_roles_and_responsibilities.pdf
    • https://cdn.sqhk.co/zogowefu/Iiihhib/retro_station_arcade_gaming_console_and_joystick.pdf
    • http://vubitim.sportsontheweb.net/john_deere_240_skid_steer_parts_diagram.pdf
    • http://itawomen.fun/episode_choose_your_story_application_keyj9i3z.pdf
    • http://tozofuji.scienceontheweb.net/silent_hunter_4_career_tips.pdf
    • http://tozofuji.scienceontheweb.net/tidubeminosasalixuvi.pdf
    • http://nijaxubazaziw.mypressonline.com/kobutawesujiw.pdf
    • http://art-practice.org/wapizuwulisugezawazubaxork7v0x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_fe66a63f19fe4e1289f833bcf806e16f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5fa24eb5-a521-4984-a9ef-7f928d39e065/dna_model_analysis_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/ac6776b4-8075-439e-8e41-121c2e793b99/beginner_classical_piano_sheet_music.pdf
    • http://xirexadugimog.atwebpages.com/99848644204.pdf
    • http://pabewuvuxaf.onlinewebshop.net/weber_spirit_ii_e-210_propane_gas_grill_red.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_5ff3ea6c27d84d1f9b008bc0abd2feee.pdf?index=true
    • 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_off0000fbe8.bin
3f84107d392f6b8ef657fa832e4e9092b9191aaad640976de909d7cf4cd72b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 5308 bytes
font_01_sfnt_off00010e19.bin
95e01de9a727a9f1b2a0dee639bcf541178abb5efb503cfc3d57b8e48a524200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 11620 bytes

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