Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91f64439ad385a1…

MALICIOUS

PDF

526.5 KB Created: 2009-08-20 10:11:53 Authoring application: mocznwtsv (via duobhcak)
MD5: e6d1dd9c63ee0dbd24e3167e0bcbfbd0 SHA-1: f6e274d11bb3bdad56e10e4606dec507e49abb76 SHA-256: f91f64439ad385a19eee8617d4d88c1a78d3eedc8f4c4921ea98cf19608730c5
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating an attempt to obfuscate and execute malicious code. The presence of a callback lure heuristic suggests the document is designed to trick users into calling a fraudulent support number. The embedded URL http://ns.InsiderSoftware.com/fontlist/1.0/ is of unknown reputation and could be related to the malicious activity.

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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.
  • 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.
  • 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://ns.InsiderSoftware.com/fontlist/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
icc_00_off00041c63.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x41C63 3144 bytes
font_00_sfnt_off00003cba.bin
5f96e1e90c4ef56487c91d02c05141dca0967f8e2bbd5d67be6c4f381f0afa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3CBA 62160 bytes
font_01_sfnt_off0000d110.bin
b661c2e877dd6b7625208ae148d736aedb24eda2d4f014262cbb7f958f538ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD110 71216 bytes
font_02_sfnt_off0001a16b.bin
8b62f203a4ab5c2ac76368029c584b4fa12fffc17f3b6e4e43a9997416807d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A16B 11156 bytes
font_03_sfnt_off0001c11c.bin
d375c22ace40f0b973d7308d85023b2e0e49d40dc51da45552d116868346475e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C11C 37232 bytes
font_04_sfnt_off00022f73.bin
afeb9e1e920aae3aca3f295f1bbccba46b16423dac14b1b5fde4b661de9198cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22F73 46764 bytes
font_05_sfnt_off0002b7ee.bin
95592346b00d039686aa3d7e22eae3d52b011e7e842a5c123f73e89ea766cd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7EE 22628 bytes
font_06_sfnt_off00037895.bin
6cf6df6beee88aa138f821122d0c1969b348cebe09cafe5b5f6a7eb8c27107a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37895 32640 bytes

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