Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab940120f1f831e…

MALICIOUS

PDF

79.0 KB Created: 2021-06-02 12:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 96f66e5638db8e7b04402427caac6d08 SHA-1: e3d036d263bd79aba6fa2ec48ce741e4361bccfb SHA-256: 4ab940120f1f831e78c14be2da2cf6151b84eee8ced02cabb59aa4f854197045
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'oniceh.ru/pbw' and a query parameter suggesting a workout plan. This, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution attempt. 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 0.9997

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://oniceh.ru/pbw?utm_term=build+muscle+workout+plan+at+home PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5fc85ba893e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_602b26de58429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_60168b03b2bc6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4496571/normal_60b645a1f3ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5fe670d9c6957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fdb8dc5d0355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fe79e8ac177d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_600e637f5f5e3.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/a4b1f33f-be3f-4cf0-9507-23f6e89f5d2b/blender_tutorial_animation_2.8.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/jumoviluretewalabaniw.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144477213/4325098093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c642b49-58e2-493f-8cd3-34b7b3f29c35/lasko_4920_tower_fan_manual.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/why_is_my_range_rover_not_starting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537abc5d-bd7f-42a9-8a79-c19eb529761c/realtek_hd_audio_driver_windows_10_macbook_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3c4e9f-7e2e-46d1-a6e9-ddd5b5ea6a23/how_to_make_furry_head_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6297c3ad-d009-41da-8dfc-d663c737f995/what_animal_has_4_legs_and_horns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1012fe6f-2be1-4fd2-8d1e-e58aa1195dc1/fodmap_liste_deutsch.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144437736/formlen_for_areal_af_en_trekant.pdfIn PDF document text
    • http://feteselulo.pbworks.com/w/file/fetch/144471627/rpl_a_despejar_l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e5e5e8-859c-46d3-b79b-46f4c038fa5f/smith_and_wesson_915_wood_grips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d5f770-dadf-4c6c-a9c5-967793aaba37/ap_style_indirect_quotes.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_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 5516 bytes
SHA-256: 917ef610854e792d5290386d76548e202a015f9e7ac73526f804aebb481fe4e4
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 10500 bytes
SHA-256: 8433c64a33b80e670161708c8e8fd6997b802a9d71ec6a5f6300a19ab35c029a

Open this report in the interactive analyzer, or submit your own file for analysis.