Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd89e434ded925eb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 10:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddddcd90e3df1934b29707e6d1a8cba6 SHA-1: cebbdd63cc2c3827fd16b2f55c4b45e07bdf6725 SHA-256: fd89e434ded925eb5c728a310e43cf17b9c2c30827c1c39f96ed07ba5ba296da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://leuphuotcamap.com/uploads/image/files/32600549339.pdf In PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/35385126896.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138518f19077---6421167025.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/83604860563.pdfIn PDF document text
    • https://fond.ru/userfiles/file/53938385919.pdfIn PDF document text
    • https://stormester.no/files/file/lekuxexir.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109071819202991.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/fefusujorazuxoxes.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/60798505695.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/22069890256.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gewesojo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tevifas.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/nekamotemizujuguku.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/xosepadowilewekuxez.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/21055504914.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/bunuzarapojusurisemolu.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/26842714232.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rilerurol.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/wokagidaweta.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/8479743978.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/dafitefani.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/89071433737.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/zinetevuzabipa.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/talosemelanezafitemugofi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba12c63877---11272637012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+avengers+3+onlinePDF 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 18676 bytes
SHA-256: b769c2ba6f67eb9ca66bde566aff96c9e2c5eec3cb8262bbce77e41bd75ea562
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 10488 bytes
SHA-256: 04a01c3ba836d150540e0ba01b2e6e56e3d385f6423a97830d6438dd6efad7d1