Malicious PDF — malware analysis report

Static analysis result for SHA-256 b461defd11e04b36…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 13:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d5d9f34afb93c1e88eeabec5e28570c SHA-1: 3a36925985b57639693cbcac47b44fd4ff1d3728 SHA-256: b461defd11e04b366d15c08a9dfb81292b5b475f478d0cb20b22c049bb136d20
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs users to copy and paste commands into a shell. This strongly suggests the document is designed to trick the user into downloading and executing a second-stage payload, likely via PowerShell or a similar interpreter. The numerous embedded URLs pointing to PDF files on various domains further support this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://pomodorolennep.de/gfx/userfiles/files/bogeluvozojibexibatafegin.pdf In PDF document text
    • http://le383.com/uploads/files/27102408631.pdfIn PDF document text
    • http://devison-matras.com/upload/file/43322778610.pdfIn PDF document text
    • http://hopkim.vn/upload/files/dovaputokavi.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/fekaninilawodupefiradipet.pdfIn PDF document text
    • http://freeorden.com/media/file/66611119908.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109101206052522.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_200709.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/34583578549.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109031010103651.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848da734cb---75253523558.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/7457806319.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/23872251861.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0af3972c---kosavakekefopime.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/gimelilikimuruvelesus.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/56750255652.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/27814051838.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/relirufiwaxebidup.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/371fff78d20d068e0d5fbd4ac54130ae/fesofujubafereveniwag.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73010904176.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/mewolusofunujemotumerena.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/wuwilikanejubutojorebopan.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/71471734516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+update+deleted+my+picturesPDF 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_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 19428 bytes
SHA-256: e96fb6c640f50e5fee2caae0b66caa680a031832d0d9bd8912f4cbfa216ca78b
font_01_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 10872 bytes
SHA-256: 6206ec1c659717ae3defcbc389b73b0a41921089a07e2d6f279726a6495c72c4
font_02_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1