Malicious PDF — malware analysis report

Static analysis result for SHA-256 193b53ced78c93c7…

MALICIOUS

PDF

12.0 KB
MD5: 784bbc7055c73153cd56b855410143af SHA-1: b5a062c65ac9b4363461cb0fcecb5eb199e6241a SHA-256: 193b53ced78c93c7d1010a5f09ff6f90f426b7c7c831042b157a39c332d104c3
130 Risk Score

Malware Insights

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

The PDF utilizes XFA forms and ASCIIHexDecode filters, indicating an exploit attempt. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as Pdf.Exploit.Dropped-90. The embedded file and unknown URL suggest it's designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dowgi.ru/ItuBF21PNxyDGU84axtoFdbr84x4Dmbc?pp=1?plugin=1
    • 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
73c4fd87dcd45b5355f088f64a1d9dfd10eb3b86ce32ca2c528225e9ed3957a7		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1874 bytes

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