PDF malware analysis — malicious · a89530c56fd5552d

MALICIOUS

PDF

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

MD5: 7fc7b133129b8a558579550ec6467331 SHA-1: 6aa63a1e023cfaa77e33530f5c3792e3afa25871 SHA-256: a89530c56fd5552d36295e054e2682253140250d273c6bf8f02948ea964c0e6d

200 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 triggers a fake Adobe Acrobat updater prompt to lure the user into clicking a button. Upon interaction, the JavaScript attempts to submit form data to a malicious URL, likely to download a second-stage payload. The presence of JavaScript and the fake updater lure strongly indicate a malicious intent.

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://na01.safelinks.protection.outlook.com.url.protected-forms.com/XVDA5R01VUlVUVFkwVG1oU01EYzVkbmxyYldSclJIQjNOMWhxWmtsc1JERXhiV05ZVkhCM1ZuZERhekpRUWt4S1VHaHhlakJKWTBzM1dVeDZOa0pVVG5Cd2QwVXliMk5wY0dwSVdVcDBXRk5pVFZneVNqSTRjV0puYzFNclMxRm9UbEF6VGxGRFUzQjBjMFU5TFMxVVdWTkJSV2R2T1VKeVNIWlhXa2xWYzJkcmJVMUJQVDA9LS0wM2MwZmM3YjhiZDA4OTcwOWRiODExNWZjOWIzMmIzODk2OTllMDBj?cid=912940672#FDF
- https://na01.safelinks.protection.outlook.com.url.protected-forms.com/XVW1GdE4xbDBkME5RTmxsaFVHMTFTaXMyYlVWWWVXaGlSVmRaUTJOQ1NHTnRhMDk0T1RGelJpOUJRall6U1V4MlJHTTRPRkJ3T1hOQ1ZrbHFWbTV1YXpkS2JrOVlielY1YWs1cVEzQTBlUzlXTlZGVGFqQXlkbTgzWTJKamJXMXJjM2xMVUN0alRtODFVRmh1VVZGMGVURXhSMFJqVFM4eE5XSlBZWEJtT1hoemEzUk1iRGh5ZDJwQ1ZXTTVPRk5LY2paU1JXdFhjQ3RhYkd0dmRtczJSV2xVTW1FeFZGWnpVVmhKUFMwdGRGaENiRFExY2xWR1Z5OUVRV28zTDJKdGJVZzNRVDA5LS00ZjVjYmFhY2I0MjJiMDBjYTU5ZDRlMTMxYTFhNWI3ZjAzNjlkYzQx?cid=912940672
- https://na01.safelinks.protection.outlook.com.url.protected-forms.com/XUml0TlJtRnRTMDkxYmk5bE5FWXpOMFJGV0djNFVUUnpTVzluU1ZBdk1VNHhLMmhXUm5VdlVVSnhRWE5vVW5KVmVITkRNbFJEYVd0S1YyY3dWMUYyWkVvM2EwMVNVMHRrVWxwTlZuVXlXVVZ2TkRkWVYweFRhMDVzYldsdUsyWTFNM2xQVUdaNGJpdEJMMDF3UmtaNUwwVkNNVE4wVEVwYVFUTTFhSFpIYUV4dlZqVm5iM0pKWkRkMlprUktZa0ZtTHpCRWRFdDRNalJaV0dKWGJUSk9jakpDVEZCbFUyNHlUa00wUFMwdE9GSTRlSFl2U0VKSU1ETjRXVWR4ZW0wdllYcDVRVDA5LS00YWNiY2FlZDUyMjIwNTg0MmM4OWUyYjM2MmRmMWRmOGFkOGQ4Yjdk?cid=912940672
- https://na01.safelinks.protection.outlook.com.url.protected-forms.com/XU2xSTWMzRldVSFZTYVdKcldqbE1WM0IxVUM5VFdFOHJZa2dyZEhoVlUyYzNabUoxTkdscFIzQlhlVW9yUlZSMVNuVmFWV2xZV2pNNFFVWkdkSHBwV0ZodWRHUTVkVXA0VTJOVGF6RnRTekZZU2tORVVrNUlkVUYzZVVwRlpHSmxaRmRpZFRaRFdGTndhelo1ZDNoUVFuUTJiazE2YTBGU1MyOUNiMUp5ZDAxMFRrMHlNbEI2VEd0S05EaERVRzVITTI5cU4wRlRaMGcyV1VwNGJ6aEhWV2xWYzJsdGRWbGFjbmRGUFMwdE1Xb3pibUZVZGpFM1VVc3hjRE5yVm5wM00zRnlkejA5LS1lZWJlMDUxZDBkMTQzYTgwODQ5NjFjMThmMTg1ZDFiNjUxYzJjNDYy?cid=912940672
- https://na01.safelinks.protection.outlook.com.url.protected-forms.com/XVW1GdE4xbDBkME5RTmxsaFVHMTFTaXMyYlVWWWVXaGlSVmRaUTJOQ1NHTnRhMDk0T1RGelJpOUJRall6U1V4MlJHTTRPRkJ3T1hOQ1ZrbHFWbTV1YXpkS2JrOVlielY1YWs1cVEzQTBlUzlXTlZGVGFqQXlkbTgzWTJKamJXMXJjM2xMVUN0alRtODFVRmh1VVZGMGVURXhSMFJqVFM4eE5XSlBZWEJtT1hoe
- 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` `043919e4b4b061ed1f9c93af2d5790e64e390b7200773f134b5da405c98aafc3`	pdf-javascript-stream	PDF /JS object 12 at offset 0x180A	639 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0012_001.js` `08e10575a51f6e028091aca4265169b4af79957917e3ad49facfead576a26302`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1831	103878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 long base64-like blob(s).
`font_00_cff_off000196eb.bin` `9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0`	pdf-font-stream	PDF embedded font (cff) at offset 0x196EB	4575 bytes

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