Malicious PDF — malware analysis report

Static analysis result for SHA-256 360f250d99d6cc7e…

MALICIOUS

PDF

70.4 KB Created: 2010-05-07 19:01:01 +02:00
MD5: a5d35f1312753582d7a65ac83410ca86 SHA-1: ddbfdb781260c2c0117dfa8aef8222dd36d177e2 SHA-256: 360f250d99d6cc7e5b8fd0303352c78208e09a243c8e237853a4008ee97e0c8b
110 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript which is flagged as suspicious. This script is likely responsible for downloading and executing a secondary payload, as indicated by the embedded PE payload and the unknown reputation of the 'http://localhost/test.zip' URL. The presence of an embedded executable further supports this. The JavaScript stream itself is also extracted as a potential IOC.

Heuristics 9

  • 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.
  • SubmitForm action medium PDF_SUBMITFORM
    PDF has a /SubmitForm action — form data can be silently posted to an attacker-controlled URL (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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 failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://localhost/test.zip
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
downloader.exe
65d498e68ac518bbe49416b77840308aaa28fd86b39ab7706314f94f815d999e		 pdf-embedded-file PDF EmbeddedFile object 118 at offset 0x10DEB 2560 bytes
stream_000_off00000060.js
59bd7d034efc9caeeff55702df9cb2e409eeb637c1926b388fcb99f3fde8855f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x60 7109 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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