Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ead359bec3604f…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 00:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04937f29fb239f9cbc02e9b67d0ceb7e SHA-1: cb1425a7f7766418bc1ec298ee512d1b1478688f SHA-256: 72ead359bec3604f3b960533264f2c340df6e12425f5277568dd43968db9b9a0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=acgih+tlv+2020+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/posaleren/gfitge4/90s_music_youtube_full_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/wjegghi/iihf_women_s_world_championship_winners.pdfIn PDF document text
    • http://slimerecipe.org/lg_washer_no_power_resets507z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6012b6f12928a.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/t6gjhdV/varibupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_5fd13ce00f051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426960/normal_5ffdf1a0ba46a.pdfIn PDF document text
    • http://penageli.getenjoyment.net/1716384710.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/RShcchj/32243933969.pdfIn PDF document text
    • http://7lessons.space/10733992881z92g3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_6033dd04a4c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_604726b917c26.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/42412403735.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/46653878275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fefd5bda113a.pdfIn PDF document text
    • http://hookup757.fun/masonry_wall_design_spreadsheet8v6ta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_60327d278b067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_34c66dd0cd4d4cbba4910a8ca02f943b.pdf?index=trueIn PDF document text
    • http://sazebufaz.atwebpages.com/burgess_model.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_f3c4c9a764f24616836c5d7e61c6996a.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_6d40432fc78c4e2ea737cecb6276e09b.pdf?index=trueIn 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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5856 bytes
SHA-256: 133bdc589f4214f53ea208007fd07a50414380db012810627090707e383e908d
font_01_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 11484 bytes
SHA-256: 7bda0a59b51864ebfab82bca604e9c6276a7971b4d8c12222f53c464b191be55

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