Malicious PDF — malware analysis report

Static analysis result for SHA-256 497194f481181cc8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 15:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6d474476045e0a9225256d1ec97e3f9 SHA-1: c94006c65e6c61aaf7f0f59a8da267b450535bbf SHA-256: 497194f481181cc8c8cc41662077250acd25a3c8a5131a9de08fb44f0bce94a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content or facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://piti.leaddeehub.com/userfiles/files/96355701189.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/25410841628.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/89898092768.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/11674960715.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135074a3f40e---dadiwi.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62765269171.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/22630803701.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/67338145009.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d59fc5e48---molel.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/dijuzeziz.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/bekufenurapomusudexikeb.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/garekawisodem.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jokelabolul.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewoputoralovixabafu.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/waxolovomububodarudikos.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/83664158369.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/63137417904.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/lonawu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/47474811488.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/nutuzepafuvetixuvadununiw.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/dukiditaput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=advantages+and+disadvantages+of+burning+plastic+bagsPDF 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 17120 bytes
SHA-256: e2da405b0109799c222896ad1fe4e78ea782058862c61e16666e519b55990550
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11084 bytes
SHA-256: e91031d86a93e44d7b172b96a4099f726d7e2152fcbd75a930bbb067c1053bfc

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