Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d11b940e3a25df5…

MALICIOUS

PDF

64.1 KB Created: 2021-03-02 21:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c47e4fe814420ce2563a467f7b11020a SHA-1: 24cc9c6ccd72ed3aeb35e33c9390c3932fc74f0a SHA-256: 1d11b940e3a25df56fd19b348927030618bf39dd2478935fdec79f957e4bf661
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, with one specifically appearing as a search result for a vehicle manual, likely a lure to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, further supporting a phishing or redirection scheme.

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://botokaw.ru/123?utm_term=1995+ford+f350+owners+manual+pdf PDF link annotation
    • http://woxijakuzadajew.getenjoyment.net/18240256792.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/xgfBWie/cat_simulator_kitty_craft_poki.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/MrgfPYD/82259039478.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/varonezijew.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/m0iePKI/buvogenerafolamixetunur.pdfIn PDF document text
    • http://puvepape.22web.org/lititewedubifufipa.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • http://wasukis.22web.org/teacher_interview_reflection_paper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462374/normal_5fe348aeb0066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fcaa21904fce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_6006ea41da1c2.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/xjhJiab/vetazozipijawurugusifegax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/nunufabepojijufokad.pdfIn PDF document text
    • http://koraxirimaxodet.epizy.com/pelavepovuk.pdfIn PDF document text
    • http://vewusopozi.epizy.com/books_similar_to_midnight_sun_movies.pdfIn PDF document text
    • http://nejidaveza.rf.gd/zumidadusi.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_off0000be3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3D 5820 bytes
SHA-256: b412f45cca4e6820b7742c61c18455482bfd736b8af5f7dd1ef857ff93a9495f
font_01_sfnt_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 9396 bytes
SHA-256: aedfe86c1bb1759dd59fddb9704729fdca9ef63d2d75b2f715b1f206af54a3c0

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