Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a990163b08e244…

MALICIOUS

PDF

67.9 KB Created: 2021-04-05 03:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eeadb5f0de7709f4c54c023bbbf1688 SHA-1: 4fedac10082f29cca4f7040b8eca0993f8b64e89 SHA-256: c6a990163b08e244066e5d8dd44d16d9065ae64dde69c219e4d5274becd22fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or using social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=applied+mathematics+3+for+diploma+pdf+msbte
    • https://fiduludebiwoki.weebly.com/uploads/1/3/4/3/134317875/xapopirabupil-wiwus-vefixulesivam-zamumux.pdf
    • http://expressvpn.store/ditufakuwugivofasokafuda9c07p.pdf
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/refozubexije.pdf
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/7570456.pdf
    • https://ronafipilegov.weebly.com/uploads/1/3/2/6/132681204/2909777.pdf
    • http://mebets.xyz/27635888874lsdt8.pdf
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/sijojedujij_lometovinife_jupefepufipuwuk.pdf
    • http://digitaltoolsfor.xyz/cleveland_clinic_doctors_note_templateoqu4n.pdf
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/dujebatefin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e18c7e9a-9019-4a70-9a95-47af13eb5564/speed_queen_tumble_dryer_parts.pdf
    • https://uploads.strikinglycdn.com/files/68b6e184-f2cf-4ccf-94e7-7cdb0660e4b8/sony_rx100_iii_instruction_book.pdf
    • https://uploads.strikinglycdn.com/files/225fa569-8ef5-4648-960c-d48a681c2bb1/kemekafojeleseketujok.pdf
    • https://uploads.strikinglycdn.com/files/9a659221-7e9b-4ae1-b801-8f9a28de20e7/what_are_the_applications_of_data_analytics.pdf
    • https://uploads.strikinglycdn.com/files/bd9e9d79-86bb-407d-bb91-707ae8dbe0bc/kusojapimurono.pdf
    • https://uploads.strikinglycdn.com/files/e008a95c-a8a0-4fda-978c-7d3d88749f52/magnavox_micromatic_models.pdf
    • https://s3.amazonaws.com/jinabom/stream_live_tv_apk.pdf
    • https://s3.amazonaws.com/nijosinizo/grade_7_adding_and_subtracting_fractions_with_unlike_denominators_worksheets.pdf
    • https://s3.amazonaws.com/kezemiradigu/osrs_bloodvelds_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc0.bin
a22aa45fbba0c6fe999ac790736bfee1ca009d56f6cfdb7fc9b20a3e1b937c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 5688 bytes
font_01_sfnt_off0000deec.bin
ed64760346307cae045e0e19a56f5c63b1b60db665079a4d85d9bf124df73b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 9880 bytes

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