Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8df0288d711d047…

MALICIOUS

PDF

69.8 KB Created: 2001-10-03 09:38:15 Authoring application: Acrobat Distiller 4.0 for Windows
MD5: b40a22cd1a8386b38f814c9edde245f2 SHA-1: ddda80bd078766d6b20ca7e5ed1ccfaef11048c9 SHA-256: c8df0288d711d0472d0f4e2bdc1095a60fcded90fc1d88444a1c60a744e4ada6
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF document employs a fake CAPTCHA lure to deceive users into executing commands. The embedded script payload and direct payload link indicate the intent to download and run a second-stage malicious file, specifically 'NimdaScn.zip'. The presence of a fake CAPTCHA and instructions for command execution strongly suggest a social engineering attack aimed at payload delivery.

Heuristics 8

  • PDF link points directly to executable/archive payload critical PDF_DIRECT_PAYLOAD_LINK
    PDF contains a clickable HTTP(S) URI whose path ends in an executable, script, shortcut, disk image, or archive extension. Documents can legitimately link to installers, so this is a high-risk delivery indicator rather than a standalone exploit fingerprint.
  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • ClamAV: Win.Exploit.IFrame-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Exploit.IFrame-1
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.pentasafe.com
    • http://www.iponeverything.net/CodeRed.html
    • http://packetstormsecurity.org/distributed/cisco-newsflash.htm
    • http://www.sarc.com/avcenter/venc/data/w32.nimda.a@mm.html
    • http://support.centralcommand.com/cgi-bin/command.cfg/php/enduser/std_ad\
    • http://www.incidents.org/diary/september2001.php
    • http://www.microsoft.com/security/tools/redfix.asp
    • http://www.securityfocus.com/bid/1806
    • http://www.microsoft.com/technet/security/bulletin/ms00-078.asp
    • http://www.securityfocus.com/bid/2708
    • http://www.microsoft.com/technet/security/bulletin/MS01-026.asp
    • http://www.microsoft.com/technet/security/bulletin/ms00-057.asp
    • http://www.microsoft.com/technet/security/bulletin/MS01-044.asp
    • http://www.securityfocus.com/bid/1699
    • http://bugs.apache.org/index.cgi/full/543
    • http://www.netcraft.com/survey
    • http://www.microsoft.com/technet/security/tools/redfix.asp
    • http://www.microsoft.com/technet/security/tools/locktool.asp
    • http://www.microsoft.com/technet/security/bulletin/MS01-020.asp
    • http://support.microsoft.com/support/kb/articles/Q164/5/39.ASP
    • http://www.cisco.com/warp/public/63/nbar_acl_codered.shtml
    • http://download.nai.com/products/mcafee-avert/NimdaScn.zip
    • http://www.symantec.com/avcenter/venc/data/w32.nimda.a@mm.removal.tool.h\
    • http://www.cert.org/body/advisories/CA200126_FA200126.html
    • http://www.f-secure.com/v-descs/nimda.shtml
    • http://vil.nai.com/vil/virusSummary.asp?virus_k=99209
    • http://www.microsoft.com/technet/security/topics/nimda.asp
    • http://aris.securityfocus.com/alerts/nimda/010919-Analysis-Nimda.pdf
    • http://www.microsoft.com/technet/security/topics/NimdaIE6.asp

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_014_off00008b16.js
2f553aad6b1cdb37b1a88d7edc63ec5d1d507f08bcb3fa33ddbf478dd0694ff9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8B16 10043 bytes

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