Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f64c5fb327a77f8…

MALICIOUS

PDF

71.1 KB Created: 2021-02-17 09:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89ad36edffff3d2f81add830eb363fab SHA-1: b49ea837e53169947187764f36e015d86df96cf8 SHA-256: 4f64c5fb327a77f87c43c67747b50b4ac90e2535f61955343dd133410be4f484
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful websites.

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://baarspo.ru/wix?keyword=tank+trouble+4+player+unblocked PDF link annotation
    • http://form-lnstagramcopyrightservices.com/the_tell_tale_heart_by_edgar_allan_pr163d.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/bubikesedeliliz.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/a_song_of_ice_and_fire_6th_book6oaqb.pdfIn PDF document text
    • http://antinomi.design/pojirazoxotipio0wj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_6003bb3ea2d95.pdfIn PDF document text
    • http://zoom-omsk.ru/angular_switch_templatec12sy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_602c526b79c14.pdfIn PDF document text
    • http://domen3.club/android_tv_box_review_mxq_pro_4k0st1i.pdfIn PDF document text
    • http://keksik24.ru/bojalolaxomanof4x9i.pdfIn PDF document text
    • http://2tanktrouble.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durozebexonadop.rf.gd/2002073712.pdfIn PDF document text
    • http://vosafaw.rf.gd/titration_gizmo_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/39756299540.pdfIn PDF document text
    • http://rinexaxar.rf.gd/android_graphics_card.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/apache_open_office_editor.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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 5232 bytes
SHA-256: 99396318bd1e02fd102ba7ab7d9a48c24de3adab54ddac11731ffe8bb95ceb1f
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10092 bytes
SHA-256: 2400ccec99b8effdfbec015cb8d846b26ef3acc6504c49ea95c1dca37c9de79a

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