Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f3437ba2108488…

MALICIOUS

PDF

119.5 KB Created: 2021-03-01 12:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53430a257ccaa061668deb9f44f966e8 SHA-1: 50d2c5a1861d61fac3eeca13353122b4fa180847 SHA-256: 66f3437ba21084884f1cc59e0da66e0a9e8670b43fc1f2c3c839e318a4d088b5
126 Risk Score

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-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://midufefew.ru/123?utm_term=tascam+dp+24sd+manual PDF link annotation
    • https://cdn.sqhk.co/rekutadis/gdhgJgd/film_songs_quiz_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_603045be18f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_602ada1362caf.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/hjjiv8B/hearts_of_iron_sabaton_dlc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fe43c22b179f.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/conair_clipper_blades.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fdf8eea01628.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/wolves_of_the_calla_illustrated_edition.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/vergil_aeneid_latin_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/gi6hgje/mujisililajokabixojogew.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/Dhdjhhe/44328364969.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/hhjaYiK/baruwen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/zelda_ocarina_of_time_3ds_n64_differences.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/gisakuvivi.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_off00019777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19777 5292 bytes
SHA-256: dcf7baa61502a9292a06b0e10c5f0e60ec388e44b91daa96fc542b58eb5bc543
font_01_sfnt_off0001a96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A96E 11580 bytes
SHA-256: 15dc343f67942622f23be5a6d9c47463719fb6f829744c00c30cf3a433f3f171