PDF malware analysis — malicious · 69785679c5b44c5f

MALICIOUS

PDF

106.4 KB Created: 2018-06-12 09:41:10 -04:00

MD5: 7e61710952c2f1b512e46c9af5509f5c SHA-1: fcf568ca0f503e5c44e6fd6edefd74d98d549a52 SHA-256: 69785679c5b44c5f5cab22f0a7bcecd38cc21a5aa6d65b86bc7c2b7e59dab91e

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains JavaScript that automatically executes upon opening. This script displays a fake 'Adobe Acrobat Updater' prompt to the user and then attempts to submit form data to the URL http://cnn.compromisedblog.com/XcmVFjaXBpZWO50X2lkPTiM3ODQzKyMTY4ZMyZjYW1wxYWblnbl9ydW5faWQ9MTQ1XNDI2MiZhY3Rpb249YXR0YWNobWVudA==#FDF. This indicates a social engineering attack designed to lure the user into a malicious workflow, likely to download a secondary payload or exfiltrate data.

Machine Learning

Nyx PDF Classifier malicious score 0.9477

Heuristics 8

PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM

PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
PDF JavaScript shows fake Acrobat updater prompt high PDF_FAKE_ACROBAT_UPDATE_LURE

PDF JavaScript displays Acrobat/update-themed language such as a document rendering engine update or remote connection to Adobe servers. When paired with JavaScript or external submission, this is a social-engineering lure rather than benign document text.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Suspicious extracted artifact info 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://cnn.compromisedblog.com/XcmVFjaXBpZWO50X2lkPTiM3ODQzKyMTY4ZMyZjYW1wxYWblnbl9ydW5faWQ9MTQ1XNDI2MiZhY3Rpb249YXR0YWNobWVudA==#FDF
- http://cnn.compromisedblog.com/XcmVojaXBpZWq50X2lkPThM3ODQzuzMTY4aMyZjYW1wbYWClnbl9ydW5faWQ9MTQ1QNDI2MiZhY3Rpb249Y2xpY2smdXJsPWh0dHBzOi8vdHJhaW5pbmcua25vd2JlNC5jb20vcGFnZXMvZTkwYzQ1NWM2MTg4
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/tiff/1.0/
- http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `d3dd1b1ab4d350e9712ff3b85036ab3e43b1199e5609d48333c0b4de5aac2d49`	pdf-javascript-stream	PDF /JS object 12 at offset 0x180A	387 bytes
`javascript_obj0012_001.js` `5c92ae507d2669a707360d0ad7eaf27c6172194cab2a0042fe311a6f745b88ac`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1831	102714 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 long base64-like blob(s).
`font_00_cff_off0001925f.bin` `9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0`	pdf-font-stream	PDF embedded font (cff) at offset 0x1925F	4575 bytes

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