Malicious PDF — malware analysis report

Static analysis result for SHA-256 10469bdefc86d99e…

MALICIOUS

PDF

10.4 KB
MD5: 781ab2e7bb0a0663c90fd47227f5068a SHA-1: 595eae9c26bba0afd2cb24ec84a11903d843e966 SHA-256: 10469bdefc86d99e1ad15b310674c7e80e3bbce8f19b6458c3426ca08411311d
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, for being malicious and obfuscated. It contains an embedded file, which is a common technique for delivering second-stage payloads. The benign URLs present are related to XFA form specifications and do not indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
3eca1ce416b21ff1ee484d619a6a49828f3ce3ec3262e668bbfcca635c5958d4		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x82 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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