Malicious PDF — malware analysis report

Static analysis result for SHA-256 85359e6d83860ac5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 11:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1a8d0d3e8179e95a7b993d18a50baf0 SHA-1: c5a43f0e9e50253b0def70f564e3cec86e6af0af SHA-256: 85359e6d83860ac5acf7ca413cb219cfc9a9c64f88718bd7de31a1951a0db2f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pantanalmsnews.com.br/ckfinder/userfiles/files/tudadezo.pdf In PDF document text
    • http://tbff-bygg.se/img/files/76917348692.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/14224545907.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/risabawobu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/worafozonef.pdfIn PDF document text
    • http://computerdoki.hu/user/file/rizadifujevutal.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8631218450.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/26414298224.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/nobupo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fc119a40ddb9f1a1051d4ed083febd31/gaxanikizovetolase.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/jujotilufitiwuwesevaxewas.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/86326843155.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/23831485542.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ralusubejupepe.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80333068208.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45758287604.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/sesategubuve.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/28090613189.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/69526202498.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/taturerajosok.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/93888829554.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/siwunifakipemusilubivimi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/bipupavodumekuguro.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210909_003349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=open+swf+file+androidPDF link annotation
    • 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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 10504 bytes
SHA-256: 52b1d7b939c5a0b8f3a90e7cc6730897250ced382d367e11beaccf55719a6ce4
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 18816 bytes
SHA-256: 2c68ff5056e3ec864e0869def5c9622b89db07325e6c1c3126cf7643f07260ee
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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