Malicious PDF — malware analysis report

Static analysis result for SHA-256 662b32cbc11f1c12…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 15:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f4ad206c2b68ce3c37f82b12646338c SHA-1: e0f54969a813683bc2b7ff8ff1596f8518f4c4b3 SHA-256: 662b32cbc11f1c128b7ccd69e735f17d047d765167385f7adbe70bfd09d06234
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a secondary payload via the embedded JavaScript or one of the many deceptive URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=fc+nes+apk PDF link annotation
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/kawufu.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/36777639750.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614af7c6a4d58---47430687179.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/gowubuvibiwalejaripokala.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/25694179115.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda31beac8---14324263193.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/90319604166.pdfIn PDF document text
    • https://granitnet.hu/editor_up/9357242780.pdfIn PDF document text
    • https://mashura.co/userfiles/files/24087881755.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/kusokefukawivatanisada.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/24396213619.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/suzakuvuvipafomuvisosevup.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/wijarajawumekavezu.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210916_4C80F850D32F7449.pdfIn PDF document text
    • https://robodom.si/files_vsebine/78471286016.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109081555368371.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tozejenoluguzaroz.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mabajejaze.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/27402157259.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bamewuwawogizod.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/zamubukunaluleta.pdfIn PDF document text
    • http://eternoohydro.com/d/files/25235629473.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/sumiginasiponijazuwe.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109031253589378.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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 22120 bytes
SHA-256: ac0fda32f8cbe5d63da62c82913f8b7f07c502903ee5385429560127cce26b5c
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 9980 bytes
SHA-256: e6d3837e7b5bc57676d235e12420e5cd6edee64393bb6c9efa5250f5f9495042