Malicious PDF — malware analysis report

Static analysis result for SHA-256 737de36a13126deb…

MALICIOUS

PDF

104.1 KB Created: 2021-07-07 08:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdd7cb25c44dbaa58bcd9836e8fb5e82 SHA-1: 8a534abbe2d479d4929e0479df221dc617dcff9e SHA-256: 737de36a13126deb5e34c75aff4dc2a9c9667db3c9d4d447cc2e9b973936ffb1
144 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic reveals the document's intent to trick the user into executing commands, likely to download and run a second-stage payload. Several external URLs were extracted, suggesting a distribution or C2 infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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
  • 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://philabc.ru/uplcv?utm_term=pdf+xchange+for+linux
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/77d51ac2c45d0ab83dd519e0d496ed53/48894723772.pdf
    • http://onlineticketreview.com/images/file/perewuzap.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b3d2b25d6ce432c07d520905077d7832/gomemewerusodixazuk.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fs041ib9n03b3skumom2vf6thc/rofaluvusekilanevavuner.pdf
    • http://sterenstein.ru/userfiles/file/fekumuzepegopu.pdf
    • http://cnp-inc.com/ckupload/files/67998551317.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83b20950---79699249280.pdf
    • http://activesolutionelectric.com/images/file/jabofuf.pdf
    • http://www.aqsclimited.com/EditorImages/file/govexokutu.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f8f845e3b65a0867204fa4e26d63859a/sijipeluvejodepum.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0d58c7e6---72157677564.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9femevtd88ah91jt0c40c2icp5/58616924950.pdf
    • https://scalper.ir/data/files/file/5865149885.pdf
    • https://laplacedesstores.com/upload/file/jozokupuwewura.pdf
    • https://energooptima.hu/upload/File/35536565026.pdf
    • http://casaatlantida.com/userfiles/file///85213761589.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/21388234633c5e962bda1354ba5931b7/povogimaxifelulopivimem.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/636f0639090f754aabe74e64e31ecf0d/71476023371.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hbi2nhsum3rnorfcif4plg7mc2/28004550890.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/60avgsao3bpbeshvdh7p56b044/ruxevabugatoxefofegunat.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xidepujowewir.pdf
    • https://kermiradiatoriai.lt/images/files/39108085544.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/1620470123065.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_off00012634.bin
03a1c338ed35c5588d65173c8dc68d930c83f79e24babdcd8bd0eb64fd5fe594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 28752 bytes
font_01_sfnt_off00016310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16310 16792 bytes
font_02_sfnt_off00017b27.bin
38b05da2c5a7277a55f50470b826942970bafa58cc33c36f901b7b709fb61643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B27 10692 bytes

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