PDF malware analysis — malicious · de91abc4fc3d2bba

MALICIOUS

PDF

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

MD5: 95fc7b7453a37f478814e09849b831e7 SHA-1: b6a0bc76fec960a683d0299b515f18a498b7b970 SHA-256: de91abc4fc3d2bba41658585a384fb23134aad68265f28ba2c505e6f1e0adcf9

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains JavaScript that automatically executes upon opening, displaying a fake Adobe Acrobat updater prompt. This script then attempts to submit form data to a malicious URL, likely to download a second-stage payload. The presence of JavaScript and the fake update lure strongly indicate a malicious intent to exploit user trust.

Machine Learning

Nyx PDF Classifier malicious score 0.9477

Heuristics 9

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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 https://cnn.compromisedblog.com/XYUdNcmNIa3JURWhOZUVkdlZub3ZWekZRYlVWeVRVTjBlRVpEVlVKS1VrbFphUzlMT0hkWWFVZ3pSak5rVkhsclprNW9hMHBqT0ZGWVFXeDRVbTgwZW1sNVEybEZLMkV3YVRKSUsxZExiR2RoZEhwM1oxbDFRbTlITWt4cE5EWklVemxuT1VKeE5FNVdRVzg5TFMxMVdtOHJZbU5WWVhGQ2RtMXhVVEJMU2k5VlZtcFJQVDA9LS01OTNhMjFjMWUzNDVkODE0ZjZiNTAwZmE0OGJjMjhiMjBjYzZkZDVl?cid=909373704#FDF
- https://cnn.compromisedblog.com/XTlRWWmVIcE9aalkxT1VoRWMyWlJiblprV1dwNGVIRlNOVnBVYzBkTk0xUk1aalZDTjFsd05DOW1NVk4zZG5oNFMyczJWVlpRVFVwa2VrMHpWa0ZYWWtOaE5qQXhRbTlNYVZkQ2IwMUxTbVJpVnpKM1UzUkJMMmRSWXpOcGJ5dFllRGxMZVhFNGJHWnlUVk54T0RCcmVXOW9hbEpMTUc1aWFuSkhRMEpvTVU4NVVGaG5jM013Wm5SWVVsWkpURUpyVWtGaE5Vc3JWRkJ3YVVwaGRFcGhlR05oV1d0YVRqYzJUaXRqUFMwdGJXTlhVV1JHVERka2RpOVJhM3BzYzBNMVExWjNaejA5LS00M2U2NTQxZWJjMmY0YThlYTE5OGNkODVlNDA0YzQzYWZlMWM3Y2Rj?cid=909373704
- https://cnn.compromisedblog.com/XVm5WeFpISjRXamQ2T1ZST1ZUaFpkQ3RrT0ZkcFVuSkJjVkUyVWpjclppdElZMnhPV0ZOUVlrVnJlRWhKZUhoTVJIUnVVbEZvTTNWalRITkJaVkZFZHpGbFVXd3hNMlI1Y2xJNGRFeE9iREY0TlVGSk1EZEJOV1p5VW5adFprbGpaV0V3TTNoc2VtMXhaRXhPTUU1R1pWQjNjWFJ5Um5NNU1YUXJiQ3RZVUVSTWJqQmpiV0lyYUZkblVsSlZhbFl4TTJaNE9FdHhjM1JoVDJwc1oycEZlSEp0TUVadlozUk9UbXB2UFMwdE5IZ3Jaa1pNVm1SSWJYcDFhRlkxUTNSc2JVMUNVVDA5LS1jMDI0MDRkMmI4MWFmZjEzZTFlNGVkMDRmY2JhZGFmYWY4MzFhZmFj?cid=909373704
- https://cnn.compromisedblog.com/XU1VWR2NHaFNOVGR3TjNaV09URkphMVE0YWpsSU1EUkxMMHBzVjA5UFpXSm5OME5QTTNJMk1IRkNVWEpNYTBoTFIyRk9VVXBzWkdoRFFYcDFaVE4zYld4SlVIcGllVEYxT0VoSFdIY3pNbWhUYjA5elZWbFFVVGs1TVdocVEwOXNNR3Q0TWpsdmRVUkdPVU5vYlc1SFlraG1hVlF3VW1ReE9XMTFZalpVVkM5cE9GZE9Oazl2V0c5SFprbGlTM2hOYkVkYWRYSlVUMUZGYm1GSGIyNTROaTlsTHpaaWJFaFJTbWhGUFMwdFYybFpZMWxqVG5ndldVSk5RbmxWT0VaTmRVZzJRVDA5LS0yMTQ1NDYxNzZiM2Y4M2EwZTE0NWY4YzZkMDM4Yjc5YTEwMmZhM2My?cid=909373704
- https://cnn.compromisedblog.com/XVm5WeFpISjRXamQ2T1ZST1ZUaFpkQ3RrT0ZkcFVuSkJjVkUyVWpjclppdElZMnhPV0ZOUVlrVnJlRWhKZUhoTVJIUnVVbEZvTTNWalRITkJaVkZFZHpGbFVXd3hNMlI1Y2xJNGRFeE9iREY0TlVGSk1EZEJOV1p5VW5adFprbGpaV0V3TTNoc2VtMXhaRXhPTUU1R1pWQjNjWFJ5Um5NNU1YUXJiQ3RZVUVSTWJqQmpiV0lyYUZkblVsSlZhbFl4TTJaNE9FdHh
- 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` `a933cacde8d4e8128708e18e1df9a7a1a4a5c6388aec0c1e9fa1ec48336c4f9e`	pdf-javascript-stream	PDF /JS object 12 at offset 0x180A	601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0012_001.js` `9daced5b399996b1cf72b3d3cc8a7c1be4c9395874a09cea98780d20d49d99ff`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1831	103726 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 long base64-like blob(s).
`font_00_cff_off00019653.bin` `9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0`	pdf-font-stream	PDF embedded font (cff) at offset 0x19653	4575 bytes

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