Malicious PDF — malware analysis report

Static analysis result for SHA-256 38886a9eb62353dd…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 07:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a50c4f13fa5dfff319c811f31d24b891 SHA-1: 5db598b8d463ef6b218fb38bfd2c96e19893ec4c SHA-256: 38886a9eb62353ddca35795731730324e92c4acbd7191a4e27f909ad38507bca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, with one prominent URL being https://mezovuduw.ru/123?utm_term=3d+modeling+software+free++windows+10. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/123?utm_term=3d+modeling+software+free++windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454040/normal_6019db931e006.pdfIn PDF document text
    • http://raxajifiwovoj.iblogger.org/55122723679.pdfIn PDF document text
    • https://cdn.sqhk.co/wasuxuletiz/jjcyjd7/tepatirizowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_6018a022e9417.pdfIn PDF document text
    • http://tuwuradozanava.iblogger.org/bugaboo_frog_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/igfkpID/8666637165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5101112c-0a01-4f83-aaf0-8a6d49158de7/horus_heresy_board_game_1993.pdfIn PDF document text
    • http://fuzaxovojige.epizy.com/22426674226.pdfIn PDF document text
    • http://dujibagakag.epizy.com/57801585534.pdfIn PDF document text
    • http://kalumeli.rf.gd/gulawoniboleron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc12ac9-c06d-4018-afaa-461f5d534273/38757125359.pdfIn PDF document text
    • http://gotozowixefe.epizy.com/32768717622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012a6398-dc94-49a1-8099-6a7c58701ff1/34534270018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca94f709-e7c1-4d7d-9494-7d3b484a1e70/68570938404.pdfIn PDF document text
    • http://ridezaxepaked.rf.gd/handbook_of_plant_virology.pdfIn PDF document text
    • http://kuwubunaxube.rf.gd/49737154771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ac2725-413d-4ca0-8c22-e34d3baffff6/selections_from_the_complete_works_of_swami_vivekananda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06552469-19ae-49d2-a923-1b4251936f7b/advanced_dungeons_and_dragons_2nd_edition_complete_set_of_26_books.pdfIn PDF document text
    • http://pelatid.epizy.com/wijelin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c355281c-c8ec-4499-815a-70000ddd77d6/pawejadukemuvobosisiloso.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_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 5580 bytes
SHA-256: 058821047e79d503aeee12742fd7bf5fd8d8f8f3d2c197087aa0f86f43f64c56
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10396 bytes
SHA-256: 89be50b2813637c53e7ad049769ee0197d0d539f14c67e608557966ee536262b

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