Malicious PDF — malware analysis report

Static analysis result for SHA-256 736c2e25cfc682bb…

MALICIOUS

PDF

192.1 KB Created: 2003-07-12 01:32:12 UTC Authoring application: Pscript.dll Version 5.0 (via Acrobat Distiller 5.0 (Windows))
MD5: 74b0fbd76b504018a3aceabf303819c9 SHA-1: 624596d5dab5aa1fb72a73e75c95fab9a7f834e9 SHA-256: 736c2e25cfc682bb9eb3e3b03cc8b345b9ad6487102cd9455a03865fe43a2eba
102 Risk Score

Malware Insights

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

The PDF contains embedded scripts and a hidden HTML iframe, indicating malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick the user into downloading a password-protected archive, likely containing a secondary payload. The embedded URLs, particularly 'http://j5b.kr/bin/h.js', are suspicious and likely point to the distribution of this payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0120

Heuristics 4

  • PDF contains hidden external HTML iframe high PDF_HIDDEN_HTML_IFRAME
    PDF bytes contain a hidden zero-size HTML iframe pointing to an external HTTP(S) URL. This is a strong malicious dropper/redirect indicator and is not expected in ordinary PDF content.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 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.networkassociates.com/
    • http://www.ro521.com/test.htm
    • http://j5b.kr/bin/h.js
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0002ffe3.bin
93de85c35a4901e011a275d4483ff2e1c3c9d72c96045f7d5b90cfc00af3f39b		 pdf-embedded-script PDF decompressed stream script payload at offset 0x2FFE3 196686 bytes
font_00_sfnt_off00000a44.bin
c1e3d1caf78c380bd408ef27d125b43300e946b18699e9ea4aa555fcd52434a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA44 19004 bytes
font_01_sfnt_off000044bd.bin
a5b534730c7a2b6755b79a8b25cac4c3cf1cb673cf5958f27ffbc78ce0854163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44BD 27616 bytes
font_02_sfnt_off0000ace5.bin
9b58aac606c8c570d243034437671ce769c2ec49917ead373608c7b9ecfb3c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACE5 24596 bytes
font_03_sfnt_off00025ea0.bin
5b22a0c4bff313d043b6a927b61aa63e3343c3963912669f9d99620c3a102e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25EA0 14908 bytes
font_04_sfnt_off00027948.bin
071f8846fb84590c60180329190f1b9cf45efeeaffb2c3c9871084ac3245f6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27948 18844 bytes
font_05_sfnt_off0002986a.bin
a093540fcee3490db4a4bf05a440400c615b2e744156c86c6e78ebe676438cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2986A 17864 bytes
font_06_sfnt_off0002ca6e.bin
27cf6fee7578d8d437ceb759dfe07c507e72303b23011f3a43fdd919ee1bf455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CA6E 14712 bytes

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