Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b3aadb26de5ea1…

MALICIOUS

PDF

1.24 MB Created: 2016-04-19 14:32:33 +07:00 Authoring application: Microsoft® Word 2013
MD5: 2326c19a000ce9e3544335bdcb7d19a9 SHA-1: 2396f879a78c81f3e76ca5426fb11dbde35b8b3e SHA-256: 11b3aadb26de5ea1c2d424ec23260e1fa5573fe47260720491c1536b8953cea6
598 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file contains a JavaScript action that triggers a launch action, executing cmd.exe. This action is designed to exploit CVE-2010-1240 and is paired with an embedded executable disguised as a PDF file named 'Bai tap thuc hanh Malware analysis PDF.pdf'. The script 'this.exportDataObject' is used to facilitate the dropping of this payload, indicating an attempt to download and execute a second-stage malicious artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 15

  • 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.).
  • Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH
    An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • /Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS
    PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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
    • http://www.zeustech.net/
    • http://]hostname[:port]/path
    • http://www.apache.org/
    • http://en.wikipedia.org/wiki/MIT_License
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_08-31-2010.crl0Z
    • http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0
    • http://www.microsoft.com/Typography/0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
Bai_tap_thuc_hanh_Malware_analysis_PDF.pdf
db14f90c8171538d76170ef22d34fdab5e44d0811d395153c3c247ae701f47e9		 pdf-embedded-file PDF EmbeddedFile object 181 at offset 0x1333E1 73802 bytes
Detection
ClamAV: Win.Trojan.MSShellcode-7
Obfuscation or payload: unlikely
javascript_obj0182_000.js
3216ff0289d1183d5aa2c35032224d6124c05723a8a1206b6c4f4d6b12574fb9		 pdf-javascript-stream PDF /JS object 182 at offset 0x13E04A 87 bytes
stream_011_off001166ae.bin
9167390d75fd8b94d1d81c444db2f36752bd76e94b3ec1c64948133ef72d6a89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1166AE 321784 bytes

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