Malicious PDF — malware analysis report

Static analysis result for SHA-256 a535475d49511124…

MALICIOUS

PDF

11.7 KB Created: 2011-05-19 02:33:45 +08:00
MD5: 3cd34a561f8491ad8e912422fc4ee6f2 SHA-1: f5a438a6673294fd462e593bc54fa5aa0b2e9f10 SHA-256: a535475d495111243cb2900e67dc25313a13f3b8d3f1ece810d63f1e8959d8bc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is identified as a PDF containing an embedded EICAR test signature, which is a standard method for verifying antivirus software. The PDF also references an external URI, http://www.pdfxviewer.com/, which may be related to the context of the test file. No scripts were extracted, and the document body was not sufficiently readable to infer a specific lure.

Heuristics 6

  • ClamAV: Eicar-Test-Signature critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Eicar-Test-Signature
  • 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.
  • 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)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000149f.bin
581b621179057c43f347b2c260495c02b065ebf21a9ea7ac67ed6609e65d6874		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x149F 5953 bytes
Detection
ClamAV: Eicar-Test-Signature
Obfuscation or payload: likely
Carved artifact entropy is 7.61, consistent with packed or encrypted content.

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