Malicious PDF — malware analysis report

Static analysis result for SHA-256 f805081f105fe5ed…

MALICIOUS

PDF

16.5 KB Authoring application: Rnaxlydtnogn Feilldksqa
MD5: 34b2199fc18a22d3145cd9f42547e315 SHA-1: 79e2ca3c729e22d754bdbc4017bb47f386bef81e SHA-256: f805081f105fe5ed8c6c380087b29ecc9c643bbaffab2e434bf340143b9b6a04
68 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, flagged as a malicious payload. The ML classifier strongly indicates maliciousness. The script is heavily obfuscated, but analysis suggests it attempts to download and execute a second-stage payload from the URL http://www1.safesentinelcu.rr.nu/. The document body itself is obfuscated script content, not user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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.safesentinelcu.rr.nu/?s7e8oqq=l5rSnKzW6diH287XoqOqmaSL4NfhsJ2WmaSqo6aay5aoi%2BLnpp%2BYnpSmqGeecKKX3eael5WjnJTVy9DXqbXJvl3VodOupJnUig%3D%3D&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
498ed7c3266ed0df9db63cfc69d0c1f6b2fe8b368beb6649ebe1c221609db223		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xA1 15798 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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