Malicious PDF — malware analysis report

Static analysis result for SHA-256 3656651e71e44d5b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 04:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0447ca2af836b00b684a0a237eddf0c0 SHA-1: 5215aae943631ed6452b7720e01e55bf34673522 SHA-256: 3656651e71e44d5ba4830a1d2dcdbcc1394f9bb549a65871e6aeb3b8b90e6915
186 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains malformed streams and is flagged by ML classifiers as malicious, consistent with a phishing or trojan delivery. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy/paste content into a shell, a common technique for executing malicious commands. While no scripts were extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick users into running further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://meuble-tunisie.com/userfiles/file/vuzasarexera.pdf In PDF document text
    • http://stjconsulting.it/userfiles/files/serizasis.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/49757491711.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/31738494521.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/57753267233.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/joxapaveriluje.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/61d000cbd79e778f6148fa10bd8d2a60/74542674317.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b42d617ee---62084199124.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909063426.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/78337133854.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/6525227241.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/58290086284.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/74868205623.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xeredoguvutelupafuwanotaf.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/1843018870.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/59323361884.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/vudeluninosoripufijudixi.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/xeniperonofuko.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/44226934724.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/kepagevukuzifunumijowedas.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407145377.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/nebaxubezokokipatotiz.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/gosino.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/37085754676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+restore+deleted+files+from+internal+storagePDF 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_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 18412 bytes
SHA-256: 889cee2045de1610b200ed3d8e2c3c67f637f250b1749ca5dde96d9efe33c0ec
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10772 bytes
SHA-256: a5866d3c5969a2c8750546b7a7bfd55385a58c3a39c7de7e2705bf994d844295

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