PDF malware analysis — malicious · ce9c0bb1eb89371a

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: 9a30e406e1f9a6552e473e5f850f72c2 SHA-1: af49d6e14bb0448ebc04815e94a4ee68560239f8 SHA-256: ce9c0bb1eb89371a4ec2cb132c4527de01ec4fe06c578c2baaf08b28d6490976

342 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains a critical PDF_LAUNCH heuristic firing, indicating a launch action. This action targets 'cmd.exe' with parameters that suggest the creation and execution of a VBScript, likely to download a second-stage payload from the embedded URL 'http://www.foo.be/'. The presence of an embedded script payload and parser evasion techniques further support this malicious intent. The ClamAV detection as 'Win.Trojan.Dropper-134' reinforces the classification as a dropper.

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.

Filename	Kind	Source	Size
`embedded_pdf_script_0000ddf7.bin` `6b1fecade938c65599b63b871a8c311cb742c489f7220fa5c46f2f3a92e4a768`	pdf-embedded-script	PDF decompressed stream script payload at offset 0xDDF7	290705 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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