Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0bd225ac239ef3…

MALICIOUS

PDF

105.9 KB Created: 2010-01-06 20:03:30 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: 87af9f1377b6ae885e2117f51e771517 SHA-1: 3a4578fecd274fc0a70827ce611ff2cfe3c4eb8b SHA-256: ba0bd225ac239ef3d9638d750e5b56d69eaec00d5314ba6ddce23ff4edc1adc6
118 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A critical ClamAV heuristic, Heuristics.PDF.ObfuscatedNameObject, further suggests malicious intent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload. While several URLs were extracted, they are all confirmed as benign, suggesting the malicious payload is hosted elsewhere or dynamically generated.

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://search.state.gov/search?oe=utf8&ie=utf8&q=&filter=0&entqr=3&ud=1&sort=date:D:L:d1&output=xml_no_dtd&lr=lang_en&client=americagov&proxystylesheet=americagov_canned&getfields=*&site=americagov&partialfields=DC_memberOf:oppor&sort=date:D:S:d1
    • http://www.america.gov/econ/business.html
    • http://search.state.gov/search?oe=utf8&ie=utf8&output=xml_no_dtd&lr=lang_en&client=americagov&proxystylesheet=americagov&getfields=*&site=americagov&q=consumption
    • http://search.state.gov/search?oe=utf8&ie=utf8&output=xml_no_dtd&lr=lang_en&client=americagov&proxystylesheet=americagov&getfields=*&site=americagov&q=recovery
    • http://search.state.gov/search?oe=utf8&ie=utf8&output=xml_no_dtd&lr=lang_en&client=americagov&proxystylesheet=americagov&getfields=*&site=americagov&q=economy
    • http://search.state.gov/search?oe=utf8&ie=utf8&output=xml_no_dtd&lr=lang_en&client=americagov&proxystylesheet=americagov&getfields=*&site=americagov&q=U.S
    • http://search.state.gov/search?oe=utf8&ie=utf8&output=xml_no_dtd&lr=lang_en&client=americagov&proxystylesheet=americagov&getfields=*&site=americagov&q=China

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
16d86f86f15bb4b916914608fae39655221928dbb3511e82fdcb4aef3e52d0e5		 pdf-javascript-stream PDF /JS object 6 at offset 0x1A9 6274 bytes
font_00_sfnt_off000065f6.bin
ed4c763e940011e4c5f2263116f48ca3bf989a89f251e6bcd5a0bcb814cdf0e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F6 74832 bytes
font_01_sfnt_off000106b1.bin
db799259556ac1cbfd7a7ba10f26f593ec3a109013b96a61074a06fefbaa752b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 49964 bytes
font_02_sfnt_off0001616e.bin
56aa84316365c64df0e693f67a6197f5d0ddb589eaae3a6c9f03edf76496eac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1616E 35504 bytes
polyglot_child_pdf_off00002c12.pdf
5365ad1f9e423d0ad08bd19ccf10ba16122721fd4824243737fd9ab3b8a3b74c		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2C12 97194 bytes

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