Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd0372b7a1d6116…

MALICIOUS

PDF

90.0 KB Created: 2021-09-12 17:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a72488aaaababfb71caa1773c69fb5f SHA-1: 94dcb1f3d00ef70cf998f8560374d60d69cd3d72 SHA-256: 8cd0372b7a1d61167c03eb40b80437ab6ead6afeb7eb6cea56f64832a3599d94
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agriturismolionsfarm.it/userfiles/files/92498315355.pdf In PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vepewubodom.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333812940ea---41043814037.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/30779333818.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/61399425713.pdfIn PDF document text
    • https://kimcert.org/E/file/xugejapekidixumimup.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/zoburarufa.pdfIn PDF document text
    • https://alkoplast.rs/files/bipolabigivuliriva.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/73279325094.pdfIn PDF document text
    • https://digireg.sk/upload/29998357116.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/siximupaxe.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/63643586931.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/37549567535.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/17553400256.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/bf2f8c0add35a5c77f89f51cabef3e76.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/24852204311.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/29273952399.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/nejuwatazamuxupur.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae2f315a5---68401297126.pdfIn PDF document text
    • https://izr.fr/files/fenikesisoket.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wodigupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+road+not+taken+critical+appreciation+pdfPDF 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_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 18996 bytes
SHA-256: 8f67809fcc30449e3c4c168d34aa701213e2067eb60684c5bcfc36fbb2f574c0
font_01_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 10604 bytes
SHA-256: aee55328b3e4e7af0ca32c7451a2861d57f9dba043c2dc519f870b0567ddf31a
font_02_sfnt_off00014274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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