Malicious PDF — malware analysis report

Static analysis result for SHA-256 348c7c8a64e56b39…

MALICIOUS

PDF

10.0 KB Authoring application: Sswihmxxvmqyru Kypxgxcbtiqcuvf
MD5: 7308e6ba78c0c0e531b7b72289cf0701 SHA-1: 79db93ca5878c5dca3f179628a5e834a889643f9 SHA-256: 348c7c8a64e56b3989956e6db67f912054076d8d46953306180f3e0289616ea4
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment

The PDF file contains an embedded script payload and an embedded file, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_EMBEDDED heuristics. ClamAV also detected this file as Pdf.Exploit.Dropped-86. The embedded URL, http://www1.safedefenseub.de.lv/, is highly suspicious and likely serves as a download source for a secondary malicious payload. The embedded file artifact, embedded_file_obj0008.bin, is also a strong indicator of a dropper or exploit delivery mechanism.

Heuristics 7

  • ClamAV: Pdf.Exploit.Dropped-86 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-86
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www1.safedefenseub.de.lv/?taa40=mMTOmG3Y2cuL2c7KoqOqlqiI6NXNcWCkw5udl8efyp%2FWi%2BnVsZKUZmmrlp6clJaM0eGwl6iTmsLDlqKws7qwitXPyaumi%2BiG&quot
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
4e595fc136fe07997fda81ddfe4257a181d9484c83476b0711116b3e92daf9eb		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x40 9159 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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