Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf59897edefe5e93…

MALICIOUS

PDF

91.5 KB Created: 2021-09-17 07:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea1239b3712e039ecb4efe01a8aa1d73 SHA-1: c2a221487c2c7f20d04dcf98710e32648e19e8c8 SHA-256: bf59897edefe5e937820ea12b8130ba9683851ba93efd44b7ee21876b44ca47a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pistant.ru/uplcv?utm_term=the+ballad+of+buster+scruggs+full+movie+stream PDF link annotation
    • http://ndt-tl.ru/upload/file/15743532575.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/99529006372.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/muziwojumew.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/86058252109.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/54723157679.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/21611922658.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901125633366029.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613baec714610---12129997492.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/nofelakezuwa.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/40582620602.pdfIn PDF document text
    • http://jsdarvin.com/files/80599037604.pdfIn PDF document text
    • http://amkchem.com/upload/files/11968930561.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/14186839898.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/99160992919.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/perovomesezomaxeredir.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gebawosirudanivuze.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/67496090427.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lodegara.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/27795079490.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840f5a54f9---22038232642.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/18853202960.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/32337422280.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/begewebekijefiruwoni.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_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 18744 bytes
SHA-256: 97c8b2d37f55b0c6e45dcb3221bc259e08aac51ca6795ea881b4a7eb525da96e
font_01_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 11088 bytes
SHA-256: f8b047bc40fe715cf27bc02bffc1ae985f258e12fd4918e1caefe9c46e7fa8f9
font_02_sfnt_off000147d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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