Malicious RTF — malware analysis report

Static analysis result for SHA-256 121d2b3610849676…

MALICIOUS

RTF

2.54 MB Authoring application: Msftedit 5.41.15.1507
MD5: 3af705b025aac003241d3f3c6cab4ea8 SHA-1: 562c9ce9b205b4ed2969690380b05ddd5797cb3e SHA-256: 121d2b36108496766bec9a5d92f8a016b26cba50e3ddee70abf2594c8b2c1197
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF document contains a high amount of hex-encoded data within an OLE object, which is flagged as suspicious. This data contains a PE header, indicating it is likely a packed or obfuscated executable payload. The presence of OLE object and embedded data heuristics strongly suggests an attempt to deliver a secondary malicious file.

Heuristics 6

  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2651KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000f8.bin
4261e5915227f454c652b8f8ec480ae02603160f86d301109646cf2cd598929b
rtf-objdata-decoded RTF \objdata at offset 0xF8 1292593 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.70, consistent with packed or encrypted content.