Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7db298ac96b8abf…

MALICIOUS

PDF

271.3 KB Created: 2011-09-20 10:38:42 +08:00 Authoring application: Writer (via OpenOffice.org 3.0) First seen: 2013-08-19
MD5: 9c8b40b7352772468eaa0a46896e3acd SHA-1: bb16486c3612c14257f77e3de4e669ff1f5f8541 SHA-256: a7db298ac96b8abf19aa271089917922e4912fcbfae87222b14b8628a07ee105
186 Risk Score

Malware Insights

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

The PDF contains malformed streams and embedded JavaScript, indicating an attempt to exploit vulnerabilities. The presence of embedded files and a secondary suspicious PDF further suggests a multi-stage attack. The JavaScript action points to the URL http://cgi.adobe.com/special/acrobat/update, likely for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9319

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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.monotype.comhttp://www.monotype.com/html/type/license.html In extracted file (font_00_sfnt_off00012b57.bin)
    • 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)
    • http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlNOTIFICATIONIn extracted file (font_00_sfnt_off00012b57.bin)
    • http://www.microsoft.com/truetype/fonts/wingdings/http://www.microsoft.com/truetype/designers/bandh/In extracted file (font_08_sfnt_off000403b1.bin)

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 22

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_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 38408 bytes
SHA-256: 3c943ac32e042167aa10820062e9af03fe1cc5336fa4e6cfae5e36a342f5a6cf
font_01_sfnt_off0001890a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1890A 24280 bytes
SHA-256: b1186ff37a3c9f7b2c928ad9c9888c7893f4ce0746120e1ad6b6e8c2e938d9b2
font_02_sfnt_off0001b804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B804 23512 bytes
SHA-256: 533285a119d959917650831277517303b88e816b1ac0d9d29fdfe175a005df0b
font_03_sfnt_off0001e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E618 37416 bytes
SHA-256: cfd8475624654acefe85dfed82dabe01906f123e364aa1043e26d7815b7265f5
font_04_sfnt_off00021c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C5F 7004 bytes
SHA-256: 0aca7df95dcc86e1ee961d72a8316f4314891022e651e5649e02bd07e325e1e4
font_05_sfnt_off00022baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BAF 9468 bytes
SHA-256: 6008a9d66a5a26f63099e836fb46d1e6408c720b10be519487445e78257fb3dc
font_06_sfnt_off00024498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24498 108332 bytes
SHA-256: 7f093fca39948530543734ff098c12a2410e2c565109727b2b006309c9fc7f82
font_07_sfnt_off0003360d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3360D 94596 bytes
SHA-256: 74b5532c87e7d8e4dc95be4b47cdbd547d3ff3a61b708e44ec1d542ed6254361
font_08_sfnt_off000403b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x403B1 10340 bytes
SHA-256: 373f2f00eb3b2be1a03d93c2590348ffe971338e657483664849e396363d81eb
polyglot_child_pdf_off0000f4a7.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF4A7 215210 bytes
SHA-256: 6646565e11a61d6aaaf25e69094c84229334aabf7f6288b59d8432174314ba06
polyglot_child_pdf_off00042564.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x42564 6125 bytes
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8

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