Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e4415bf6e02063…

MALICIOUS

PDF

85.5 KB Created: 2021-03-19 12:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 44085094abdc391a6153f2293bc13b39 SHA-1: 19234bc422143976612f00c2ecd79abc535bbbf3 SHA-256: 21e4415bf6e02063e66dc3c7b43471f7f129ca6a6b03e0eae8da39817d4f3b65
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 0.9998

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://dugedepap.ru/wix?keyword=sec+swimming+championships+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fec20d908d00.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/taking_sides_clashing_views_in_abnormal_psychology.pdfIn PDF document text
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/gavaxepawitifafevu.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/57132636777.pdfIn PDF document text
    • http://pevewoxoxup.scienceontheweb.net/bepewola.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/guviluxitojogoxoretisep.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/bangkok_map_bts.pdfIn PDF document text
    • http://sportita.fun/563697595266hzo4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6024f8918cf96.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/ifgiimD/47798964950.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/dhiTQIN/download_facebook_lite_latest_version_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/npjitkb/gravity_blanket_reviews_amazon.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/0ca6dc05.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/689400896656izur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_53969d04dcdd49c9947878e576c29d20.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_6d9d0ef04b48472caa4c9e30ddf0c15a.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_d639c02ffe034966a3765c38cb7727e7.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_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 5688 bytes
SHA-256: d847717930426af1c5b85c228f3a8fc737274b7bf516f5d42b08c01604b66497
font_01_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10548 bytes
SHA-256: 934dce3dd022fb6b5735a94d06d931ea0028d2d70bcda4d884f20c3bb9e158a0

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