Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b23655e7b65d89a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 012c772b24c8ed306626da164d841b0c SHA-1: 56a466640b7a8cbfbe0b575b30de26626d8c795f SHA-256: 4b23655e7b65d89a92956236d23cb4a0dd8e767719d65fbc00de614cbf319ec0
124 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 structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a pattern of distributing malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7033

Heuristics 4

  • 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
  • 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://laborke.ru/uplcv?utm_term=wet+woman+in+the+wind+movie+watch+online+free PDF link annotation
    • http://kartinatv.org/uploads/files/gigironefafogevanulitoxiz.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/lawelanododipufiwojek.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dff9747e---49075107794.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pebujivapepifopidojeju.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/90128207723.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/34709960976.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/46974239475.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/kenazuvogetatid.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/defovotarojizovebit.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/nexuzerevojafalerutugop.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910121234.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/jejufipube.pdfIn PDF document text
    • http://z500.si/files/14080683683.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210906_C7B686B06378160B.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/35376962343.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/papakojaju.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d6cd63722ae85abbd28bc7a584d64a0/42705189170.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/53184104435.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58922246829.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/jagilo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 10720 bytes
SHA-256: 6e0452458b46a5923d80b3f58fc26c41a0a909f7fa5c8c1a489d1f60077f94bb
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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