Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3feab5e083e389…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 11:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1762503f068ba370fad19810ae430c2e SHA-1: 7f562b3456612da8ca7a3b72f0713e9b37bd12a1 SHA-256: bd3feab5e083e38904dadc47e4199cc536ca1dfbe92b1d47c9b5be3fe6e2dee2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous extracted URIs, some of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=fake+valid+visa+card PDF link annotation
    • http://evopizza.lt/ckfinder/userfiles/files/bugize.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/wejabadaresuxatijef.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/99617203197.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/dupazatigopegaf.pdfIn PDF document text
    • http://halanmilk.com/upload/files/32014382635.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/bilupemon.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/81628579944.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/1001958540.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144daa8cd120---jesagimibevugedorube.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/95206482477.pdfIn PDF document text
    • https://nomortiga.com/contents/files/zibimi.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/61146613256.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/8726161906.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/35131844377.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/sekizivedi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146806ed73b5---fididawifatavasuf.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/61269360439.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/xalunadalisetawasike.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jipeve.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kinazebazuvaresasu.pdfIn PDF document text
    • http://salkim.com/userfiles/file/57210568810.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/subamebamejeki.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/19585173610.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/68112160386.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/56488050549.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/lemadijunefilawe.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_off0000b429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 15208 bytes
SHA-256: c8b5ade922a428a5ea5348c61791a657fed1d7a357b97e4e9d2d46d8359c9ae3
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10176 bytes
SHA-256: 2a72b92507d2dc5117091e42f37e4c2b291ce681102a9a9ed5723468b15210b4