Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ae7c9050c5ecac…

MALICIOUS

PDF

294.7 KB Created: 2011-09-20 10:38:42 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: de095f05913928cf58a27f27c5bf8605 SHA-1: 44306a93578229c8b1f461ca3ca6d5ef3cdc1755 SHA-256: c2ae7c9050c5ecace012a76e140404e88345d48d341b35797d0f32fe0e987f4d
224 Risk Score

Malware Insights

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

The PDF exhibits multiple high-severity heuristic firings, including PDF_JAVASCRIPT, PDF_RICHMEDIA, and POLYGLOT_CHILD_PDF_STATIC_TRIAGE, indicating complex malicious behavior. The ClamAV detection of 'Pdf.Dropper.Agent-7217724-0' strongly suggests its role as a dropper. While no specific script content was provided for detailed analysis, the presence of embedded files and JavaScript actions points towards a multi-stage attack designed to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • Secondary embedded PDF body has suspicious static findings critical 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.
  • ClamAV: Pdf.Dropper.Agent-7217724-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7217724-0
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 13

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
3000b3469a8bd553f177da3f507a5ea2271a3dee1fd5d5343f41950837af583c		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x3B36 163 bytes
embedded_file_obj0002.bin
66b82b096ae83103365f40b9b767a5582b0a497e4589e7b9323eac0320c61808		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x3C27 1670 bytes
embedded_file_obj0003.bin
e763ac63c3d21786709e7f462b463575525d0e344202f42dbb96897a01541e78		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x3F43 785 bytes
embedded_file_obj0004.bin
720c47f19e6a058099295d18a16b7149cc73fe497eb78821ea810f3192228dc4		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x4138 150 bytes
embedded_file_obj0005.bin
c8a82f67dfd8d68c2f8fe494ca2deee4604701c8f02863bf87d222b992e45de9		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x4209 2955 bytes
embedded_file_obj0006.bin
4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x4583 200 bytes
embedded_file_obj0007.bin
4273cd319df227c91b92e5509527bb4f6e1abfb3aa2beec2fb2adb93a8671f62		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x4676 835 bytes
embedded_file_obj0008.bin
4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x484D 56 bytes
stream_002_off000003ed.js
529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3ED 1363 bytes
stream_003_off000005ca.js
e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5CA 902 bytes
objstm_0047_00.bin
856830b101f28eaa61f2ccb44204fecaa2d0a9658055009fda363a9d3056ff76		 pdf-objstm-decoded PDF /ObjStm 47 0 obj (inflated) 2543 bytes
polyglot_child_pdf_off0000f48b.pdf
6274bbe06bf7418d6d24dcf3aded489a26139d7ac2cc6814621c93c9e7b2f42b		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF48B 239199 bytes
polyglot_child_pdf_off000482fb.pdf
9a95102ad6b4d58a9a742832f61490a27e9b62855fe295b13214addfda321ad3		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x482FB 6127 bytes

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