Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0befa3a9b05e6f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 15:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d5e2eb92352b5fa7ee9169608a8dd89 SHA-1: 999bbec54d6e0520d60fd25266fa512ec6eb9cbe SHA-256: 4d0befa3a9b05e6fc2a0072b61b6f73d6c1ce11ba1972392737f34494df25b0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=descendants+free+movie+online PDF link annotation
    • http://radissonhoteltraining.com/userfiles/file/54244696791.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/79407365330.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/54766364471.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210909143159_08xpps.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/fifajomifezoz.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xifad.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/lexugixusolabufagi.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/kababibof.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/16678071579.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/titevofapejikokodivop.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/jumuwojol.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109091615135911.pdfIn PDF document text
    • https://luminex.pl/upload/file/87798597233.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/lunabu.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/83387419217.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/dugufimikenas.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/garexadi.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/332543952.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/20063910237.pdfIn PDF document text
    • https://lapakunited.com/contents/files/1252196262.pdfIn PDF document text
    • http://bienbao.net/uploads/files/90571739985.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/30452956605.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/viwosobukubofusiwuw.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/92654487776.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 17224 bytes
SHA-256: 98fa992bc7ee135fb069d2b13635306cabb6105ec246045f36b2bae874788fab
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10704 bytes
SHA-256: 11ab3898b28f030d930b437f2d7c54e7144ebef462661f535387ea87ead57892

Open this report in the interactive analyzer, or submit your own file for analysis.