Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d61c5faf0f9d1e6…

MALICIOUS

PDF

425.8 KB Created: 2010-02-09 19:58:56 Authoring application: Microsoft® Office Word 2007
MD5: 84d5fbf569882e18ce2366d7c81fae84 SHA-1: 6d92627c42fb9b1689f51f29b2544a9f1ecffcb4 SHA-256: 7d61c5faf0f9d1e6a6d6e6b1b72510071847fb5a34d36b8b32256669b1ecb0c9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a hidden HTML iframe, indicating an attempt to exploit a vulnerability (CVE-2023-26369 related) to execute malicious code. The embedded script and iframe likely serve to download and execute a second-stage payload from the identified URLs, which are currently marked as unknown reputation. The use of embedded scripts and external iframes points towards a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier clean score 0.0173

Heuristics 4

  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • 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.
  • 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://78.41.233.99/~fhv3/slidein.php
    • http://78.41.233.99/~fhv3/pub/iframepubns10.html
    • http://www.microsoft.com/typography/ctfontshttp://fontfabrik.comYou
    • http://www.microsoft.com/typography/fonts/default.aspx
    • http://crl.microsoft.com/pki/crl/products/CSPCA.crl0H
    • http://www.microsoft.com/pki/certs/CSPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/tspca.crl0H
    • http://www.microsoft.com/pki/certs/tspca.crt0
    • http://www.microsoft.com/typography

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000dd6b.bin
1aad8063d0fc2ba0f49f5d90a6b99cd8876c6da5e4e080ca8d93abc3ebe8e88c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDD6B 195580 bytes
stream_013_off000503b9.bin
28b8cf049f18db4945d920dff4cf9cba43c704150d5b8132d8121bbc1a54837c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503B9 181744 bytes
embedded_pdf_script_0006a60c.bin
db6429697d81c467d5fe69e14f243e03bd92627c8b913d08c5db16d1454d6659		 pdf-embedded-script PDF decompressed stream script payload at offset 0x6A60C 435952 bytes

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