Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f4597255c3d82…

MALICIOUS

PDF

74.4 KB Created: 2021-05-12 23:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e85b77acdc46a2665735763af516c12 SHA-1: b1d1cac8be199e62bc99197af368018203a754bc SHA-256: dc1f4597255c3d82a044ed4124f9e7629c30120087fe712ea047c85e034d6ece
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/strik?utm_term=how+long+does+it+take+to+get+good+at+stock+trading PDF link annotation
    • http://bimoriz.getenjoyment.net/convert_base64_to_c.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/30651943055.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/percy_jackson_auditions_2021_disney_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/0fjfGc6/download_mega_photo_pro_2020.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/bijulomimebokej.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/asterisknow_configuration_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/TAQhaP5/shredder_chess_engine_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5ff864e9561aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_606a57946eb99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jozaponi/pujebumabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f4b8c3-80ce-434d-92d7-47c35893cedd/tedubuw.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/38476091687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b8942e-9b7d-487a-a09d-408bc16786e2/lesuvogamavafowimuxebi.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/accelerated_reader_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf59cbf-d584-4025-9209-a10abc8555d2/fasaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6bbe34-c539-46d6-b759-d2ce6cd39384/interpersonal_communication_everyday_encounters_ebook.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/calendario_agosto_2020_stampabile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5ed3aa-6a66-4e28-a0c6-a4b25623b8d2/23198399798.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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 5224 bytes
SHA-256: 176c5a274abbeeb1549021528609b8382c0b049dcb758508f9efcaa80b0ba2c3
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 11080 bytes
SHA-256: db3362152e5150aec5dbfffa6f0033cf1e333f36a8e28f3150ee26ddf8ab65d7

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