Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0744a92cf6d9bc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 04:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65192ee24e8b35d7ebf81e477dd75057 SHA-1: 291edcca9d8b4e2eaf45db5455ed73c0f8881cef SHA-256: 2c0744a92cf6d9bc7d92dda61dad470c95027a0b3be6fba5400b8c13462b9b49
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell. This is a common technique for executing malicious payloads, often delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8004

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
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=adb+shell+not+found PDF link annotation
    • http://telegid.tv/userfiles/file/80491638016.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/29120041192.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea03335e1---88843711789.pdfIn PDF document text
    • http://odumakus.com/uploads/files/20873413042.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/wajobesagozanaxufasu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56707688107.pdfIn PDF document text
    • https://servicepapik.ro/files/60014296863.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/45065692168.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/43221254169.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161309730a60ab---95128161639.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/66927350689.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/15538630833.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/10097081853.pdfIn PDF document text
    • http://rsst77.ru/upload/files/najojawuwumaxowadatak.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/pimikugelol.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/5877140350.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/buzivado.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/xevodupisosigov.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/53751169627.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/87761888640.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/76339221531.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jadugosofitiwen.pdfIn PDF document text
    • https://tuinvandecruys.be/file/38572451926.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/xulilodofufakasotuwupazof.pdfIn 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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10320 bytes
SHA-256: 260287638f21a99f1b4b44e7d9c9ee1db23bf299bc538d3d0ee6bee9427cae07
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 19056 bytes
SHA-256: 8ed662dd0fdd2d13545aae8ff0fbd7b1feab112b9a330a43810fd48963f9354a

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