Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a0902f68011195…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 15:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0900e3e98caf51a02dff89e3ebad5dff SHA-1: 14f4b76c32d41e4b14cac2a16e2d24a82abfaffa SHA-256: 65a0902f68011195e4a117993f8a1abf7e626bc40955bd3ea50603d9d646dafc
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=ken+jeong+tom+and+jerry PDF link annotation
    • http://abpaluso.com/upload/file/81378591875.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/98193042761.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/savivadaguju.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/ladepujoduzefexur.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/vifukofokobiralojive.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/70719138442.pdfIn PDF document text
    • https://cargotavio.ru/files/file/nogovamijivibadofu.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sened.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/poxisedapezagogop.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/dapivoluravezo.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/65154009498.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fbd898b25be53bf632547cc0cac2a908/fetibidenaj.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/68901868799.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/degiluwegetavis.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/bolirupuvek.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/rifovemefi.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/lozewisuvabo.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pebakokexupef.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3b608a7fc3ae6964dbb0d1c093924e3e/94880530192.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/wiwede.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26286373575.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/pawasetaxo.pdfIn PDF document text
    • https://salonrewards.ca/images/file/83029338754.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/badibuxivugozufifezibotu.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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 10520 bytes
SHA-256: e24dab31864732c41685ae0ad20636f99d4d8bf6ec40575872bb0dfa0a56d6eb
font_02_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 18132 bytes
SHA-256: 1b8c37a3e34a49df639a332d19a2138339ef60aa3cdfead2388ed974863eae5d

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