Malicious PDF — malware analysis report

Static analysis result for SHA-256 a591df2a98706e95…

MALICIOUS

PDF

283.9 KB Created: 2010-02-07 22:10:13 +01:00 Authoring application: LaTeX with hyperref package (via xdvipdfmx (0.6))
MD5: 9584cd97d0ed4225eea40cf9fc996b56 SHA-1: 74d8ebe672040f15228d87063f0129c086b14c3f SHA-256: a591df2a98706e951308d7fa3e99b6a3ad7d43eb3220c5bd492c03dc8ce0ad20
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains a critical PDF_LAUNCH heuristic firing, indicating it attempts to launch an external executable. This is further supported by a PDF_LAUNCH_COMMAND heuristic indicating the launch action targets 'cmd.exe' with parameters that appear to construct a VBScript. The embedded script payload and the ClamAV detection as 'Win.Trojan.Dropper-134' strongly suggest this PDF is a dropper designed to download and execute a second-stage malicious payload from the URL http://www.foo.be/. The PDF also exhibits parser-evasion techniques.

Heuristics 9

  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c echo Dim BinaryStream > vbs1.vbs && echo Set BinaryStream = CreateObject("ADODB.Stream"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Win.Trojan.Dropper-134 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-134
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www.foo.be/
    • http://www.gitorious.org/~adulau

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000ddf7.bin
454c06647c183a86e228510e3dd6a5e6555072123b00ad5bbede284cd4efda9b		 pdf-embedded-script PDF decompressed stream script payload at offset 0xDDF7 290512 bytes
Detection
ClamAV: Win.Trojan.Dropper-134
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s).
font_00_cff_off00003d8a.bin
09e18e495b68106a55aace3f441183e73b28de0f6fbcb0af0b76d08e38de00da		 pdf-font-stream PDF embedded font (cff) at offset 0x3D8A 15636 bytes
font_01_sfnt_off00007386.bin
1bbf8d898c7de34b2ed1bfb68d2725a06e3c5e09957aee601794b4fe88adb9f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 13054 bytes
font_02_cff_off00009b0d.bin
81cd2ec160f0dbbfecf3a7282aa50fb69c8be6a3e42aa5a6d27c573cc7517a2e		 pdf-font-stream PDF embedded font (cff) at offset 0x9B0D 7529 bytes
font_03_cff_off0000b8d9.bin
19f70b70255abac1a93513d95c8ae661c9f9d2f99400a22c24727869e919e5ad		 pdf-font-stream PDF embedded font (cff) at offset 0xB8D9 7369 bytes

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