Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af4e81da6051071…

MALICIOUS

PDF

239.0 KB Created: 2017-11-26 08:59:53 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 50f56ac731f3d5b68b32f0865387f012 SHA-1: 07bf3f3269568f9ef1ea925bce8b8b18dfe09384 SHA-256: 7af4e81da605107168ceae8e74b64b02d60e2ce4a188510aea1a356092713976
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that, when executed, attempts to redirect the user to external URLs. The primary malicious URLs identified are http://www.lnt.eng.br/armacon.html and http://www.multcalc.com.br/calcvigas.html. These URLs are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.lnt.eng.br/armacon.html
    • http://www.multcalc.com.br/calcvigas.html
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000bb4a.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBB4A 264072 bytes
embedded_pdf_script_0003acfa.bin
4e4f6e57f628c9b723ead648dba5aa3b7f0194da64d4ca0a1ed7ffe492bbf9ae		 pdf-embedded-script PDF decompressed stream script payload at offset 0x3ACFA 244745 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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