Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0cbbd07d7bb9c3…

MALICIOUS

PDF

1.24 MB Created: 2016-04-19 14:32:33 +07:00 Authoring application: Microsoft® Word 2013
MD5: 44cd051eda330affff2287afd98b9bea SHA-1: 3a42f3a2dcc6aebe1152e2225cd39087d71d0649 SHA-256: aa0cbbd07d7bb9c3c99f18d43beb78d8a13b05b560a7fc78e514a40db3f0b056
370 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566.001 Phishing: Spearphishing Attachment T1187 Exploitation for Client Execution

This PDF file contains a critical heuristic firing for PDF_LAUNCH_COMMAND, indicating that it attempts to execute cmd.exe with specific parameters. This is further supported by the CVE_2010_1240 heuristic, which flags the use of a launch action with shell parameters and an embedded payload. The embedded executable payload and the ClamAV detection of 'Pdf.Tool.Agent-1388586' confirm the malicious nature. The embedded URL http://www.malwaretracker.com/pdf.php may be related to the payload delivery or tracking.

Heuristics 12

  • Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240
    PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\Bai-tap-thuc-hanh-Malware-analysis-PDF.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.malwaretracker.com/pdf.php

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0182_000.js
11913a354de4ec28a36470a61a903efdeb758f40d1c10b8352ab2b54054dcc3a		 pdf-javascript-stream PDF /JS object 182 at offset 0x13E041 87 bytes
stream_011_off001166ae.bin
9167390d75fd8b94d1d81c444db2f36752bd76e94b3ec1c64948133ef72d6a89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1166AE 321784 bytes
stream_013_off001333e1.bin
6bc5879c56af84349204900eaf288eb4a6f44036dc631154124ef00cf98c86d3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1333E1 73802 bytes

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