Malicious PDF — malware analysis report

Static analysis result for SHA-256 4933fdddccb78766…

MALICIOUS

PDF

27.3 KB First seen: 2013-04-26
MD5: 9e755363153f34982886a457def55c11 SHA-1: d782643c9ffbe246d1486128003b67331fb94834 SHA-256: 4933fdddccb78766b232d8afed2d6fb587d8126281b3cac99d71bfd69c706518
64 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, which is a common technique for delivering malicious payloads. The embedded JavaScript likely downloads and executes a secondary payload from a remote source. Several embedded files were also extracted, which could be part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9469

Heuristics 5

  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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)
  • 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.bitstream.com Referenced by PDF JavaScript
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/xfa/promoted-desc/Referenced by PDF JavaScript
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://ns.adobe.com/xdp/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/2.6/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/2.8/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.6/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.7/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.6/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-form/2.8/Referenced by PDF JavaScript
    • http://ns.adobe.com/xfdf/In PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x48A7 163 bytes
SHA-256: a88d45dbaca718190e20900f96ce60e576aeb5c217c6043a028d2912b70d4d0d
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x4998 1873 bytes
SHA-256: 92ddb0d659e9b57ae3dc6ec489796bf078ee7b77f9645cedbac39b28c4d329d1
embedded_file_obj0003.bin pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x4D14 2410 bytes
SHA-256: 4032fc0c49f18ee6a3d09055a7a24b30defc6ab2ff36d633e8b3b4b083e35fd7
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x5202 3023 bytes
SHA-256: f6828dd1c2c33f5f9b3d297876597a713abd12a8e3a8bcc14eda8a62895139c5
embedded_file_obj0005.bin pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x5593 143 bytes
SHA-256: 7e029e6d31508d12b10932efb079b6b82d39bd10563234e22fc201035e2c4bde
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x565D 1535 bytes
SHA-256: 25759c36b5868ce5809e2d056fb770d5ff55551bc49c57993e9938ed933bc8a6
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x5916 80 bytes
SHA-256: 2ebdd7efeaa1190ff6bad8cbd649b313e3969564018f204e7385b97c2fab1e19
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x59BF 56 bytes
SHA-256: 4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1
stream_002_off00000349.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x349 1313 bytes
SHA-256: f94e41f586bf3f20bc1deeac4bfbda388a61db43f25fbd6304ba73f5653368cf
stream_003_off00000527.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527 902 bytes
SHA-256: 1b2ec98752b966f601d5223a750559cf13d562ac5e5c6d1fcc7217835b01f5fd
objstm_0033_00.bin pdf-objstm-decoded PDF /ObjStm 33 0 obj (inflated) 977 bytes
SHA-256: 1cbbb9e3448f7173ee3cc6655c574d35d01e7bfc7fc081ed773aa11e1df753d3

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