Malicious PDF — malware analysis report

Static analysis result for SHA-256 81208c41444d1738…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 09:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd9603d73a130647951f55488150502a SHA-1: c940ad66dbe68586c5d6d3ff693effcfb1029a62 SHA-256: 81208c41444d173840d57afe039b2ecb2e1d04777afe2bdf19da8c93e19c64f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's likely designed to exploit PDF vulnerabilities or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=challenger+sales+model+pdf PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/28431e06c38b3b033b72eb005a92f1ac/joferabavilotedo.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sisivivikotuxete.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/2609770675.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/9798900877.pdfIn PDF document text
    • http://altus.pl/userfiles/file/rivodosirafixujix.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/31899305048.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/jafinusupedi.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tisitabowedevaranusuboxad.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/pozewupilelezizote.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/94318570354.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/35929806196.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/78835392353.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/13815478144.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/rifelu.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/wagupetukurixodutoxa.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/nodosexatule.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/63918885605.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/95814380628.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/dodijekezenaximuw.pdfIn PDF document text
    • http://kalikraft.com/images/file/62024322873.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/8246118041.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/diop2geheavjbivsjfgu2fo578/54887427706.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/lizefitarewototokepa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lijojafaxekok.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_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 10788 bytes
SHA-256: b4c51a6e3de644c8fc3b6561dab2a4cc9cc4e90cfa203f1d5d3441be4f24bee4
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 18428 bytes
SHA-256: fbae7e6de2a43f24383fa92099b17abb1997bb26de7f3d0a276c15096c1e2912
font_02_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1