Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54d44fe756e7066…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 11:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a6ee58e0620f17045a17554e6ed8320 SHA-1: 37712ef22e1f4c18b6816a08640e2b910ecbd04f SHA-256: d54d44fe756e70663db68559d3e2c184f6083f5501f8e76c3d40e1c946eacd2d
114 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy/paste content into a shell, a common tactic for executing malicious commands. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to exploit user interaction for compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=super+backup+%26+restore
    • http://lumieye.com/userData/ebizro_board/file/joxufawobubimodutip.pdf
    • https://beautyyaurient.com/editor_upload/file/8267681757.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/73233370471.pdf
    • http://kayapalinakliyat.net/file/pesizi.pdf
    • http://khachsandomino.com/hinhanh_fckeditor/file/wasozigovi.pdf
    • http://mamitobe.ru/files/file/gimuroziri.pdf
    • https://al-farh-iq.com/upload/userfiles/file/55566144685.pdf
    • http://www.dereformasenalicante.com/archivos/files/62941367217.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c022e6e53d9df10e661e0d0aa6604c3/31025520086.pdf
    • http://makeyourpartnermelt.com/userfiles/file/53969415567.pdf
    • http://cnkls.com/userfiles/file/1631710635.pdf
    • http://tuzy.pl/Upload/file/lujemug.pdf
    • https://valergences.fr/userfiles/file/rezux.pdf
    • https://0955205219.jwa.tw/userfiles/files/vopexu.pdf
    • http://goldendazzle.com/upload/quangtri/files/90118660815.pdf
    • https://yifff.se/userfiles/file/kuzotirekilibubufanoka.pdf
    • https://weilmclainboiler.ca/fck_upload/file/4063619260.pdf
    • http://musicincw.com/fckeditor/userfiles/image/23702027379.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/bexiruwinup.pdf
    • http://chinamakina.com/userfiles/file/87909880630.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59851887898.pdf
    • http://vietsinphar.com/uploads/files/15390003503.pdf
    • https://mumegram.com/userfiles/file/87248435407.pdf
    • http://pasaru.com/upload/files/zalatogivubolotag.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/jojalikasakafivexemaxuzi.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_off0000d302.bin
8c720327761dc8e33b964f933812840d75c5c4ea3dd0c4bbfcf7ccef79224f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 10144 bytes
font_01_sfnt_off0000e995.bin
42d91f4588cad0e1948da6a8a2f69e6593fc9dd5269fed87d0b2c4678d7527da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 20256 bytes
font_02_sfnt_off00011ee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes

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