Malicious PDF — malware analysis report

Static analysis result for SHA-256 207b91b4fd5c0aa8…

MALICIOUS

PDF

94.9 KB Created: 2021-09-19 04:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc3097f9e3c2e3d5dc5dfe22e25fc945 SHA-1: f0f5aea639e9fe4325d375c2c55874145c85e55e SHA-256: 207b91b4fd5c0aa81fc0742606d2f0330c8a2c3b53ec0cdfecb1e61a6c7b9d1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of external links align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ilyxrace.com/userfiles/files/21307448842.pdf In PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ninilazikamozugan.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kijamaxoraw.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///felaletidasuwexal.pdfIn PDF document text
    • http://envigest.cz/upload/file/88498914456.pdfIn PDF document text
    • http://rinsacars.com/files/others/vepomozi.pdfIn PDF document text
    • http://hkacca.com/userfiles/tifutezanokexurawuvajum.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/88631140961.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/76419886443.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146584ace08f---64649962027.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/41838270324.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/94206973957.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/38631480720.pdfIn PDF document text
    • https://salonrewards.ca/images/file/10007366350.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/dumejedanadezudikofezi.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/8456449937.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/kugubajobaju.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/97375289107.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntjj8i6n002laq3hmo4rstsoeb/46945208869.pdfIn PDF document text
    • http://marketingnews.fr/images/file/vobubuwimazufusenepo.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/28474818365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+quiet+place+2+islandPDF 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_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 19124 bytes
SHA-256: 6137a3723e7345e138d7567b5719be0684bf9606ab82c223ac57e0c52a68ef00
font_02_sfnt_off00015632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15632 10636 bytes
SHA-256: e823e1fa4eeb300f11718a13593c498bfa70dd7191108883705d0e568aa3d7c5

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