Malicious PDF — malware analysis report

Static analysis result for SHA-256 003dec271b03bafd…

MALICIOUS

PDF

78.5 KB Created: 2021-04-28 00:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 87ab27bbf302e3f7c81af4e552b88f54 SHA-1: d8a0522de4368cef5490bd4af8f5c8b08a5f1b7c SHA-256: 003dec271b03bafd5a6ade6369fdd3a612ada43d9f948e2a9aa484c14cd3a729
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or tracking intent.

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://jacksth.ru/strik?utm_term=d+and+d+store+brooklyn PDF link annotation
    • http://bajifepeselok.sportsontheweb.net/fundamentals_of_anesthesia_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5fdd669f3d24e.pdfIn PDF document text
    • http://casser.xyz/formulier_alleenreizend_kind_transaviavj31f.pdfIn PDF document text
    • http://sbrf.link/temple_run_2_game_appvnfhe.pdfIn PDF document text
    • http://7lessons.fun/56301303551xzx0t.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/poxuvew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5ffbaf8e41f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6058cc8023480.pdfIn PDF document text
    • http://getallcreditscores.info/woboludorerasipure7kgt4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b1249915-de03-4dfd-8283-efb95fa5f0d4/57479727793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cb04a2-1c3a-4c88-8b2f-bcc5240f9b53/darej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b2246f-5f4b-478c-b16b-c6e7fd5960dd/37497635217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8089ee-dcbc-4f98-a0cd-9bc58ef779bf/zizenadujawifekosok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592e27e5-0b29-44ca-95c1-cc9d10ceb2f1/jands_vista_m1_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8021d5eb-dd9f-4dcb-ada9-fd9958aa118f/autocad_student_download_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d9b4c3-084f-4930-bb1e-6678323b40d2/sapiniv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9f6802-59ee-4a9b-9100-fe4c75e5c8da/christian_pre_marriage_counselling_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f91fdec-1695-4614-aeb2-a295e2217ace/excelsior_definition_oxford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88637b19-645c-4b3b-935d-0eee8e558d80/morumumozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15594262-ab73-40b3-b2c8-95d5b4823238/jaburixutugozofi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 4864 bytes
SHA-256: ba4de1ef10b8af43db3792d334ff4dfa429a005047d37e3cf213fc5945c90182
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 11036 bytes
SHA-256: 87bab69a88d98c370e6157d1e0186ae0eff5242e6b2c1f5750b3dfcdd6883cd7
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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