Malicious PDF — malware analysis report

Static analysis result for SHA-256 744a946da1384f1f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 09:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ee9a088e8798c63db4cbb789e6ad59 SHA-1: cd86930b54c7e8c66cdd03c2eb99e04c404ac534 SHA-256: 744a946da1384f1f1ed1f064a2af4d2d0abfa676d665193c66d701580d7bb3f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=watch+coco+online+putlocker
    • http://heorungminhphat.com/luutru/files/56500927614.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vutuwiz.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/lorodupasawuf.pdf
    • https://sapsda.org/SapmaUserfiles/file/59255042322.pdf
    • http://corising.info/sa_upload/userfiles/file/20210913103616.pdf
    • http://notar-frings.de/userfiles/file/32608795326.pdf
    • http://dallard.fr/ressource/site-image/files/80448281911.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4d13db13---migunoninogig.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317749ad99d---bavuvesinuxiduvus.pdf
    • https://sunrise-photon.com/upfiles/editor/files/10062354219.pdf
    • https://tomclarkvoiceovers.com/userfiles/files/32356423073.pdf
    • http://ukrfirework.com/images/file/25745563084.pdf
    • http://snieznik.pl/userfiles/file/bagavanobosazawebegazoso.pdf
    • https://autoroman-service.ro/imagini_ws/98919275991.pdf
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69152731378.pdf
    • http://capitaldanceacademy.com/userfiles/files/monosotakexaxamavenufazer.pdf
    • http://5thaveseniors.org/userfiles/file/verufodunusiwonileg.pdf
    • http://cartonwrappingmachine.com/userfiles/file/vudemulezig.pdf
    • http://originalavto.ru/userfiles/file/fabebopajotodob.pdf
    • http://weorderfood.com/uploads/files/23491534704.pdf
    • http://nriloan.jctoursandtravels.in/files/gugamolifofotexazositu.pdf
    • http://szwygs.com/upload/70375324796.pdf
    • https://dailyhondaotomientay.com/upload/files/23456991376.pdf
    • https://geneolock.com/ckfinder/userfiles/files/21867533051.pdf
    • http://iccjsc.com/images/uploads/files/68244440053.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdc2.bin
bd0f0b69c7d0eb88b69aa7eb6c0bfae6b80828469b06d0e931b79e30be86abdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 10488 bytes
font_01_sfnt_off0000e589.bin
6da1ebae7c943b7bae9b2099109127ad4244df942d11adab57c2f081e3d3f374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 20984 bytes
font_02_sfnt_off00011bf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 16792 bytes

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