Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a53a97ae6bc3b95…

MALICIOUS

PDF

71.7 KB Created: 2021-02-24 15:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 409cdf4ada16802852f01236a58c8b08 SHA-1: f8cd93a57169bc9ebbe7cbf4b6194a22d89ad1ae SHA-256: 0a53a97ae6bc3b95d4fc514a9c5b973e5b7f38e7c033d45ba2e46cb009992d11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or low-reputation platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious 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://bologen.ru/strik?utm_term=how+to+follow+alkaline+diet PDF link annotation
    • http://zefabafiw.22web.org/introduction_email_templates.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/mofoxotijirunek_wikur_zolokotuvut_sugulix.pdfIn PDF document text
    • http://kamaz-ftc.com/kumitetoxetojoragef8hpj.pdfIn PDF document text
    • http://makamar.tech/jarudpqi4n.pdfIn PDF document text
    • https://cdn.sqhk.co/woragumokewi/ijehiDY/fevupiwi.pdfIn PDF document text
    • http://cashthe.ru/78417346205lmjnz.pdfIn PDF document text
    • http://arfesopt.com/artful_dodger_movin_too_fastywqw5.pdfIn PDF document text
    • http://xoridamewok.iblogger.org/coringa_e_arlequina_hq.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/YKzd8ic/farelaxuxurutemonuw.pdfIn PDF document text
    • http://esportzmlevent.com/rocket_royale_hack_apk_20208rpv5.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/cLLZieG/28449217241.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/dijjaQ8/60218437348.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/a5787.pdfIn PDF document text
    • http://martakkord.ru/alter_ego_francais_a2kbtsd.pdfIn PDF document text
    • http://app-3null.com/furelibolokalekitelunoletvjakv.pdfIn PDF document text
    • http://best-ital.fun/jackson_kayak_fun_runner_70cgkde.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/395051a1baaca47.pdfIn PDF document text
    • http://stopnutristrike.ru/841188071998ks39.pdfIn PDF document text
    • http://yeswins.space/78398284758tqvq7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 4744 bytes
SHA-256: 16caa0cf60209ddf6e554ee933a762d8b9859b7153cbf76099a87aa30ed61673
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 10848 bytes
SHA-256: 0c022390d650d69cb2b5b93044d7bd5bab6190bb46db6d175357b4c34d750458

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