Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d3fd81952ffab1…

MALICIOUS

PDF

24.6 KB Created: 2016-05-26 05:05:44 +09:00 Authoring application: Hancom PDF 1.3.0.480
MD5: 2a7a558ca100a0d9b9cf8973a0ad8424 SHA-1: 8ed5e1da7f1021860ae56008788dd5892ce5b58c SHA-256: d1d3fd81952ffab1d52509a0d6dd7bcd27017e082ec99d4b0c4a0004577c4fdf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file identified as malicious by ML classifiers and ClamAV (Pdf.Dropper.Agent-7173235-0). It contains embedded JavaScript which is a common technique for delivering second-stage malware. The JavaScript is likely responsible for downloading and executing additional malicious content. The embedded URL 'http://www.aiim.org/pdfa/ns/id/' is of unknown reputation and could be a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Dropper.Agent-7173235-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7173235-0
  • Embedded PDF child has suspicious static findings high PDF_EMBEDDED_CHILD_STATIC_TRIAGE
    PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/id/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0037_000.js
89f710196c5f8c999ae27adb6fa1f92a47853ba4fcd1007bfd48a8f5c5643179		 pdf-javascript-stream PDF /JS object 37 at offset 0x4909 5220 bytes
icc_00_off000014cb.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x14CB 3144 bytes
font_00_sfnt_off000024fa.bin
61e928e3651493fde4dc3dc607b864856ab91cd063fa1b7481a91406ba508561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24FA 6136 bytes

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