Malicious PDF — malware analysis report

Static analysis result for SHA-256 3032a3de3cd4b7a2…

MALICIOUS

PDF

76.5 KB Created: 2021-05-11 01:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24a509aaca68b94f5fd7ed9170ba5319 SHA-1: 20031252bfed7967186487246ca0edc12ccb67a7 SHA-256: 3032a3de3cd4b7a26e267f644d85f10370e3c7304815111637b1943dc0145290
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or scam attempt. The document body is heavily obfuscated, but the presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=fz+bike+2008+model+mileage PDF link annotation
    • http://serarudipiwuvon.mypressonline.com/cosmic_energy_meditation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fe0ddc9333fe.pdfIn PDF document text
    • http://claire-irk.ru/20809763881747go.pdfIn PDF document text
    • http://circulyarkadigital.xyz/gudulanawomevidawawupesainuv2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fd1d8a8d329b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_605f4d6972d6a.pdfIn PDF document text
    • http://naturmilans.fun/vorifafaww6vr.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/day_trading_book_reviews.pdfIn PDF document text
    • http://discount50it.pro/gimulitugivea9od.pdfIn PDF document text
    • http://italia-doc.fun/conflict_resolution_strategies_in_relationships5u9mx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewuwuja.onlinewebshop.net/problem_solving_101_free_download.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_58487859d5ff42f88747da623ab82621.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02757857-a546-4f27-bb06-d8a5d70f394d/how_to_get_my_child_to_follow_directions_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1275989b-fc6c-4315-aa44-9a3fc3426fcc/division_fast_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68b1943-5350-47f3-80da-cc881eb52fee/what_is_the_sat_late_registration_fee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813cf786-b930-4a5b-bfe3-ccb7cabef982/what_are_some_writing_utensils.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_25910118a3a741cda90e997f738c1eff.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_089ecd961c95417c994e2546cf2dc05a.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_77c53189aa584f53a753c24f37551995.pdf?index=trueIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_c000185bd3664a6eb571afa611e3fe83.pdf?index=trueIn PDF document text
    • http://boxijekew.atwebpages.com/78976173390.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_1f4826059ef84d0382823641f7d9c04a.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_71ed3482cfc542f1b262660c9e68ea00.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f96ca339ecec4e24a2043940b9cfe972.pdf?index=trueIn 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5548 bytes
SHA-256: 2a071817b4ae7ebbd4566521bf3b822e432c9b7b939a8341772485ed69114755
font_01_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 11340 bytes
SHA-256: 88440c44616b749349a6261b9b303025c8dce951864ad403400e1dd2deee7d89