Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bef925aff97e6c…

MALICIOUS

PDF

106.7 KB Created: 2021-02-10 20:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 83916a82045105de898913ada3fe9b50 SHA-1: ee243e390b7656f3c8dc8531bf5e2f69077c6225 SHA-256: b6bef925aff97e6cb1ed18c844b74742823606f1e94a1ecbb1cdf052b063b57e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://druttle.ru/123?utm_term=2002+jetta+manual PDF link annotation
    • https://cdn.sqhk.co/vakenuda/e7TlsvW/miniature_painting_professional.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/jfijdVA/ninja_run_up_and_download_for_pc.pdfIn PDF document text
    • http://dle-tpl.site/loraxovrpb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_600a5067279af.pdfIn PDF document text
    • http://bu-markett.com/f1_2016_season_standings52934.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/la_vie_dun_simplej5we2.pdfIn PDF document text
    • http://copyrightreports.com/42498447026nfrjq.pdfIn PDF document text
    • http://biomanix.best/swot_analysis_journal_articlesbn7ce.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/hjpj4Pz/21614133060.pdfIn PDF document text
    • http://prizinsta365.website/sigevajeppxpf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_600518f89883f.pdfIn PDF document text
    • http://sexesex.site/pokemon_sun_and_moon_3ds_rom_free_do51fyb.pdfIn PDF document text
    • http://idealica-uficiale.website/autocad_2010_free_for_macbook_pro1s6oi.pdfIn PDF document text
    • http://arfesopt.com/desierto_informacion_en_inglesjlmuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fefe8d94bff9.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/ruzaganog/kuzaloloxadilon.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/76058203654.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/avengers_infinity_war_4k_wallpaper_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/language_arts_worksheets_grade_2.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_off00015ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD5 4812 bytes
SHA-256: 31174c9260edb67d5ec15b038cb51d0bec58aabb7e3a977c0964d2aef2686a30
font_01_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 15608 bytes
SHA-256: 26466cf4c2f571dff3b17ffab64191effd707e20078effbf62764a18d2e72972

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