Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccef9c992a016be2…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 11:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 00624f081c20750b0fa9b561bad0aa16 SHA-1: f3ebf0bd0b7b708829482e5c7b448ae70b90690a SHA-256: ccef9c992a016be2595762ec72cb406b26c75bdc8460e097b5853c7ee9657f36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded links are indicative of a malicious lure.

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://jumiwimov.ru/strik?utm_term=american+assassin+movie+review+rotten+tomatoes PDF link annotation
    • http://bavimobuxadu.medianewsonline.com/bikiturosoluvilijinev.pdfIn PDF document text
    • http://nepufikusugepa.iblogger.org/bufenizupononelit.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/72984054291.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/A2jgbgc/like_a_boss_movie_2020_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/hfhajf4/pyramid_run_magic_bone_apk.pdfIn PDF document text
    • http://xuforaxi.22web.org/67027866943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5fe032e06b775.pdfIn PDF document text
    • http://titodisoke.22web.org/bopukepefuk.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/essential_oils_and_their_benefits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_602b128eabab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_6057930eca121.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/82a3a687-a762-449e-9dff-b10336f7fc78/convert_1_mole_to_kmol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c720f0-092b-4759-b93b-662c7f955615/30798406057.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/bissell_air_ram_cordless_vacuum_with_extra_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/alerting_services_in_library.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d863e8-5489-46c0-842b-f6861f7f8740/18028776292.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/kumizevuziwetir.pdfIn PDF document text
    • http://mirurisiruxowal.epizy.com/dunelitokazekajilu.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/second_shift_arlie_hochschild.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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 5052 bytes
SHA-256: 15a5d32bc5dd69cd34b5fa6186075c7faaa611c5600dd8f3aba5938b6b302896
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 10840 bytes
SHA-256: 8d281677c352c3869a95d07827eafc3e33a3aad8c9192d95e2ceb9bc890650cb

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