Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d2e7542dbc356b…

MALICIOUS

PDF

275.4 KB Created: 2011-04-21 10:12:15 +08:00
MD5: 9e53eefcc0f0280f007918e3f8053723 SHA-1: 2809c28c62ac26ab499c9ac9859eee1a0b178b1e SHA-256: d4d2e7542dbc356b704594fc4796b644ed6b1eac20139c56bf684f45a89350b6
88 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded SWF (Flash) files, indicated by the PDF_RICHMEDIA and EXTRACTED_FILE_STATIC_TRIAGE heuristics. One of the embedded files is named 'demomm.swf', which is a common indicator for Flash-based exploits. The ML classifier also flagged this PDF as malicious. The presence of embedded Flash content strongly suggests an attempt to exploit vulnerabilities or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5151

Heuristics 5

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
demomm.swf
34795402dec6f0e76362c5c7ca84e2e082f62417789e34f04b043d399500d6e7		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x27D2 265216 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
ff.swf
c15d1b0ae096906de92dcb033a30bfe919fa67bba32f4e44caa6d89451966f71		 pdf-embedded-file PDF EmbeddedFile object 63 at offset 0x43B79 2662 bytes
objstm_0075_00.bin
d6b6ddbe00cbec768a9637c465fb0433727ed912ab3ceed7ee9854cf2e22025e		 pdf-objstm-decoded PDF /ObjStm 75 0 obj (inflated) 904 bytes

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