Malicious PDF — malware analysis report

Static analysis result for SHA-256 536662a2f760dcc9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 00:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c6e97207348ceedb2c5c5972398fd77 SHA-1: ba7bf0d6279f2be6c84ea9f884baca067c011e47 SHA-256: 536662a2f760dcc9d4bc1dc4f01e1d45eb463aa44eb04fb15815045249014436
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It employs social engineering tactics, specifically a 'clipboard command execution lure' and a 'browser extension installation lure', to prompt user interaction. The document likely aims to facilitate the download and execution of a secondary payload by instructing the user to interact with their system's command-line interface or install a malicious browser component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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 http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/tufolebiforijezijuzezo.pdf
    • https://bvphcn.bdata.vn/upload/files/75379460025.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88251660593.pdf
    • https://rintrans.com/files/11688774653.pdf
    • http://dakov.hu/_user/file/14844739869.pdf
    • https://karate2.cdmedia.pl/userfiles/file/tijusupuro.pdf
    • http://mylodge-naoshima.com/xafuza.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/jalifijezozuxevusefosog.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386cca62ee0---32374910512.pdf
    • https://curewelldiabetes.com/userfiles/file/83243086348.pdf
    • http://www.jasfec.com/imgs/uploads/17720624123.pdf
    • http://hzdsbg.cn/uploadfile/1631756216.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/3238017997.pdf
    • http://faurau.com/luodan/images/userfiles/file/wokujidarinonevuxivixitad.pdf
    • http://plkorea77.com/ckupload/files/zemuwidisomebilexosedig.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/12433474111.pdf
    • https://unaizahic.com/Files/files/tananigusuvawodifok.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210902_075330.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/jazatusajataxut.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/5374909013.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/bazenemujosi.pdf
    • http://tcgardening.com/userfiles/file/2021090309172773499.pdf
    • http://www.asiacoservice.com/file/files/xuvozivuropinezixufodig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=play+m3u8+on+android
    • 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_off0000d27c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 16792 bytes
font_01_sfnt_off0000ea8e.bin
246c7391525bd34e2121768299d254a1828677abe9332fa9ca8da8e45986cec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 18668 bytes
font_02_sfnt_off00011a48.bin
0985c34665861958301953132de3060f1a3143abd35be3e6d4f1df3315399097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10604 bytes

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