Malicious PDF — malware analysis report

Static analysis result for SHA-256 536118f6bfd3c65e…

MALICIOUS

PDF

120.0 KB Created: 2010-04-23 12:43:52 +08:00
MD5: 03a9ba21d16551e97d14dd1385333eaa SHA-1: 2c3f040eaa2f2fd8c120390a1ebc8bfbe8cfb6b5 SHA-256: 536118f6bfd3c65e2dd4fbd8eaf4414b483d06ac2e9844263d2335646c19f4c9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1553.005 Mark-of-the-Web Bypass T1105 Ingress Tool Transfer

The PDF file was identified as malicious by ClamAV with the signature Win.Virus.Expiro-10021101-0. Static analysis revealed an embedded Windows executable payload within a decompressed stream. This indicates the PDF is acting as a dropper for a secondary malicious executable. No specific document body text or scripts were available for further analysis, but the presence of the embedded PE payload is a critical indicator of malicious intent.

Heuristics 7

  • 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.
  • ClamAV: Win.Virus.Expiro-10021101-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Virus.Expiro-10021101-0
  • 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.
  • 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)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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.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
stream_010_off00001b62.bin
d666105e42ba6a7a582f943ace136a9583b9d6bf58ceb399b67d93d35f277046		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B62 241664 bytes
Detection
ClamAV: Win.Virus.Expiro-10021101-0
Obfuscation or payload: unlikely
objstm_0040_00.bin
fefb14e8fee47a9a47ffd73a073668c8ba18a685c584141bd8d8f1e2495aa5a1		 pdf-objstm-decoded PDF /ObjStm 40 0 obj (inflated) 1928 bytes

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