Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9c0bda27bbc80d…

MALICIOUS

PDF

887.0 KB First seen: 2021-02-23
MD5: 23d2592db15c251382706515cf4fd37e SHA-1: 8949c1d82dda5c2ead0a73b532c4b2e1fbb58a0e SHA-256: 7e9c0bda27bbc80d947bc0c6ce29a19c824288d2b481f92a1637b7b8dfc8b81c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and an embedded Flash file named Tatsumaki.swf. ClamAV identified the file as Pdf.Dropper.Agent-6205993-0, indicating it's a dropper. The embedded SWF file is a strong indicator of malicious intent, likely to execute further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Dropper.Agent-6205993-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-6205993-0
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Suspicious extracted artifact high 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.
  • 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/2.6/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.6/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdfx/1.3/In PDF document text
    • http://ns.adobe.com/xfa/promoted-desc/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
Tatsumaki.swf pdf-embedded-file PDF EmbeddedFile object 18 at offset 0xDCA3F 4070 bytes
SHA-256: 4b6931fba0925ce3c4298fc158a37ccdd8a18d23bca221872dda4a6bdfd00321
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=SWF; declared_or_context_type=PDF; filename=Tatsumaki.swf; kind=pdf-embedded-file Carved SWF contains ByteArray/Loader/loadBytes staging terms.

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