Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9f212eb4298e2c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 02:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8ac8ad36b7463939f087a2a5ad718a7 SHA-1: 3197d6946f306544f61b8d8bfb40bc8bae9df9cd SHA-256: 4f9f212eb4298e2c83603e0b3476f3ccd01a5d2d4d00d25b92d7bce3c913a988
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on potentially malicious or low-reputation hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=love+island+season+7+episode+5+watch+online+free PDF link annotation
    • http://zgkimsteszew.pl/img/upload/files/50861209683.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/ziwased.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/69397302318.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/sovewu.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/wofitafopalajeke.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kabesatemibotivavaxi.pdfIn PDF document text
    • http://idroter.org/userfiles/files/buxonevozixizusat.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/5047143937.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/jojawexi.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/48344197639.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/17266782429.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/67055214687.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/rutasanatuvikujut.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/60213101674.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/75a4a012ea8704e3e357bcef30874ac7/pexibusigevef.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/19461185887.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/bakagafupise.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/57592885424.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1e4705b---resasajuboserefogutirev.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/razevixibiwepe.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/89525850304.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_off0000adee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEE 11008 bytes
SHA-256: 1b3d9133840065ff77a10544a6a1e8a9ba44c1c33b2247dd8a1238269813cb97
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 14316 bytes
SHA-256: 204641b62940ca3b8efc8b59fb9e4d495e8039c2ed00767874b5b8d4a3fb4b2f
font_02_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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