Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6387d1415c2e85d…

MALICIOUS

PDF

88.9 KB Created: 2011-09-20 10:38:42 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32)) First seen: 2013-10-08
MD5: 88b884e8ce014d6b8d30b8198e048708 SHA-1: 315076b216873e35437d032b4804d34f1f883d31 SHA-256: b6387d1415c2e85df20a3fd54c185df9bf0f563378eb06e0808b9e74b51783f8
246 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it's a dropper. It contains embedded JavaScript and RichMedia (Flash) content, suggesting an attempt to exploit vulnerabilities or execute malicious code. The 'Image-only document with action trigger' heuristic indicates a common phishing lure where a user is tricked into clicking an image that leads to a malicious URL or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 10

  • ClamAV: Pdf.Dropper.Agent-7216686-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7216686-0
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 2 text block(s), carries a click-outward action, and is only 88 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 1 related finding 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://ns.adobe.com/xdp/In extracted file (embedded_file_obj0001.bin)
    • http://www.xfa.org/schema/xci/2.8/In extracted file (embedded_file_obj0002.bin)
    • http://www.xfa.org/schema/xfa-template/2.8/In extracted file (embedded_file_obj0003.bin)
    • http://www.xfa.org/schema/xfa-data/1.0/In extracted file (embedded_file_obj0004.bin)
    • http://www.xfa.org/schema/xfa-locale-set/2.7/In extracted file (embedded_file_obj0005.bin)
    • http://ns.adobe.com/xtd/In extracted file (embedded_file_obj0006.bin)
    • http://www.xfa.org/schema/xfa-form/2.8/In extracted file (embedded_file_obj0008.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 14

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x3B36 163 bytes
SHA-256: 3000b3469a8bd553f177da3f507a5ea2271a3dee1fd5d5343f41950837af583c
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x3C27 1670 bytes
SHA-256: 66b82b096ae83103365f40b9b767a5582b0a497e4589e7b9323eac0320c61808
embedded_file_obj0003.bin pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x3F43 785 bytes
SHA-256: e763ac63c3d21786709e7f462b463575525d0e344202f42dbb96897a01541e78
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x4138 150 bytes
SHA-256: 720c47f19e6a058099295d18a16b7149cc73fe497eb78821ea810f3192228dc4
embedded_file_obj0005.bin pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x4209 2955 bytes
SHA-256: c8a82f67dfd8d68c2f8fe494ca2deee4604701c8f02863bf87d222b992e45de9
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x4583 200 bytes
SHA-256: 4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x4676 835 bytes
SHA-256: 4273cd319df227c91b92e5509527bb4f6e1abfb3aa2beec2fb2adb93a8671f62
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x484D 56 bytes
SHA-256: 4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1
stream_002_off000003ed.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3ED 1363 bytes
SHA-256: 529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f
stream_003_off000005ca.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5CA 902 bytes
SHA-256: e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a
objstm_0047_00.bin pdf-objstm-decoded PDF /ObjStm 47 0 obj (inflated) 2543 bytes
SHA-256: 856830b101f28eaa61f2ccb44204fecaa2d0a9658055009fda363a9d3056ff76
font_00_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 25632 bytes
SHA-256: 9deb1b9f8d540749c7f959968d185dc976dc5754180de3407fbd6b0343327cc1
polyglot_child_pdf_off0000f487.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF487 28411 bytes
SHA-256: 953108cae551419404cf0dfcaff25c1bc0d55bb8eec57da0f8aec65bcecea0a1
polyglot_child_pdf_off00014b93.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x14B93 6127 bytes
SHA-256: 9a95102ad6b4d58a9a742832f61490a27e9b62855fe295b13214addfda321ad3

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