Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05aed3bb744bc3e…

MALICIOUS

PDF

77.3 KB Created: 2021-04-02 12:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a38fbe506117cb084f560acb6578dd93 SHA-1: 5ddd1666698fcd39ed57f7c95ebd03fa968884d2 SHA-256: c05aed3bb744bc3e8e62786f0913ad981908cd1dc1c773d1d6d135cf71ba3b22
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary URL identified is https://kuzutuzo.ru/award?keyword=bridges+in+mathematics+grade+3+home+connections+pdf, which likely serves as a lure. No scripts were extracted from this sample.

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://kuzutuzo.ru/award?keyword=bridges+in+mathematics+grade+3+home+connections+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461497/normal_605515928c8a0.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/nosimokase_garadomax_guluwumim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fe591e7427dd.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/bD6iigd/20040671107.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/dijjaJP/38015569830.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hf5fDfm/toca_boca_hair_salon_3.pdfIn PDF document text
    • https://muruvarulem.weebly.com/uploads/1/3/1/4/131406835/06b5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_604d3a3063a45.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/eQbqiiJ/mogane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_4835f39c63344c69bf3c62e857da1c6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/11727417088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9906b568-b550-4a4e-9e24-e46453b32252/98001020536.pdfIn PDF document text
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_635c46c5620f4caaa60739f3c064a44a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead35625-d288-4f88-87ae-c80969eea90e/harry_potter_6th_year.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/doraemon_new_episodes_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5772e91f-b067-433f-a729-0d723ce9a6c2/big_blue_party_speaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/check_out_procedure_in_hotel.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_2f49f68d807643308fd356c7597eae9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58410eaf-f03f-46ca-bd88-53f3ab30ea07/9810885505.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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 5748 bytes
SHA-256: d6cd8d55cf368e16a4d4abbb83700e6616da5e7b9a20ab66eed7b3842a8b06bd
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 11392 bytes
SHA-256: cfd33fb218490123beafdcc15b8b94df85f56cc0e6a006010a70ef16f11ffe71

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