PDF malware analysis — malicious · cac8b218935582d0

MALICIOUS

PDF

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

MD5: 2495b2295bfd35f704a0f2073ac56bd5 SHA-1: ae5fb02aa4953bf204e73d8574ebbb3514de3999 SHA-256: cac8b218935582d07c38ee671650bd536ec33c7814896345ae038c414816320f

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains JavaScript that triggers a fake Adobe Acrobat update prompt. Upon user interaction, this script 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 for initial execution.

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://securemail.kb4.io/XY1d0NVZreERVeXRMVmpKMlVEQjJVRU5uZERWRlNrSTVjVU5HUWt4VVRrdDJNemMzWkRoeWN5czJSbWhwWjBsSlJtTnNSR0ZXTVM5M2RIZFpOVm8xZUUxblRqQk1aMU5yVjJKT04yVmtiVFZCVTNFMGEzVmFUWEJVTkRoSllqUlFaRGs0VFZWVGNFVmxTVlU5TFMweGVDOXhlVmszTXpsNWNVWkVWWGxZV0VremNtaG5QVDA9LS1lNTBjMGFhMWIzMTk2Y2NmYjE3ZDk4ZGYyOWRlYjY2NWY2YTA0YmY0?cid=83452571#FDF
- https://securemail.kb4.io/XTkhkUGJHWkxjRkJPZDJsck4xWklOazFrY21OemVsbDRaMnNyWmxkUVExVmpXV05TTW0wck1uZFpka3R4U0VWV00yOTViblIyUjBjMWJFZDRiM2hZU1N0NlpUaEJiWHB2WVZoMUsza3pNVU4wY3l0c09UZ3pkemRIS3pGaGFVdFZXSGw2VkcxellWaEtkRVp6TkdsMmRITmxiVWhDVmxKbU0yNVBhWGR6T1VoNmF6RTVaVVJ0V2psc1pUUlVhblJZTm5wM1ZVbHBaMVJNV21adVlVSmpiRFJOZDJGRVZEVktMMkUwV2xBNFVqTXljM1ZPZUc5TVNFTnVhV1V3WjNkTkxTMUtLMkZKYUdNeGN6aFZSRUZKS3pWWlNtWk5VbkYzUFQwPS0tODNlYzA4OWY4NzNmNGVjZjBhODY5MzA4YzA1YjQ2NTNmZGQ5MGY1MQ==?cid=83452571
- https://securemail.kb4.io/XVW5Jd1FubGtURGRDVjNCbWJWWXdlVFZsT1ZONVJEUlZVblU1UTBORmJIQllUVVpJZDNCRE5sRnplbU41T0dwNlVGSndWbGxJTXpSUloyNHJaU3RoTDFWVVkxcHRUbkZ2UzNJdlZGcEpRbkp4WjAxSVpVSllhV012UkZKVlZFcFdMMU14U1RKS05EazNRM0JqT1ZZeVpsbHRVMmhCUVhoTlNpODJRMDR6VG10dVJFMUZkVFpKY0c5T1VtbHBSekZ0Y0dodVRuSjVOa1J1VTB0U1pVeFhkVUpXVld4clZEQnpPWFZ6TVhNcll6ZHBSREoyVG05alNtRXJOSFp0ZEM4eExTMU5SM292YVRSblEzSXpMMHROU1N0V1RFUTVVV1JSUFQwPS0tMTgxOGJlZDAyYjIxYjk1ODA0MjYzNWViNTE2NzVlOGMyMmFmN2JkOQ==?cid=83452571
- https://securemail.kb4.io/XYTFGVlVGQktkV2RYV25WQk5VWjFlV3d2VDJsaWRtOWlXazQyVVRJeVdsSjZZMFpTVUVZMmMxSnNTMWw1VjNKd0x6TllNbVUwZDJ4TFNrUlZlREpvWkRVM1ZIaDBLMWx0Y0d4aGIyZEtZak0zV1c1eWRVZG1hakp2YUV4V05GWjNkelZhU21aNVoyMHlWbWNyZW1sV1QwRjZNMGxZVWxsTloyTlphbWxPYVRObVpHSjNTM3AyWTJOUGRTdDBha0oxUW14NFNVaFVhMVJtY2xBNVdVMDJlRVpGUzBsbFZuSXplVEJpTWs5dlMwVXhUSGhUV21oWmJrdDZiWFExUjAxUkxTMWhabUpPZWtnME5sQkVNVnBtUW5wbVJXc3hOMGxSUFQwPS0tZmRhYzVkODRlOGE2ZGI1ZGQxNDFmMjE3MmRlMmRhYzczNzU0NzdmZQ==?cid=83452571
- https://securemail.kb4.io/XTkhkUGJHWkxjRkJPZDJsck4xWklOazFrY21OemVsbDRaMnNyWmxkUVExVmpXV05TTW0wck1uZFpka3R4U0VWV00yOTViblIyUjBjMWJFZDRiM2hZU1N0NlpUaEJiWHB2WVZoMUsza3pNVU4wY3l0c09UZ3pkemRIS3pGaGFVdFZXSGw2VkcxellWaEtkRVp6TkdsMmRITmxiVWhDVmxKbU0yNVBhWGR6T1VoNmF6RTVaVVJ0V2psc1pUUlVhblJZTm5wM1ZVbHBaMVJNV
- 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` `890c70f28cb1f935f9b042f0a00bcf92252b4432d13072e31487908875829f7e`	pdf-javascript-stream	PDF /JS object 12 at offset 0x180A	594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0012_001.js` `05e10b5a920cd103a47f0873ad30f8a1cc5a1538856dd6f0cadaeb46413bf463`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1831	103818 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 long base64-like blob(s).
`font_00_cff_off000196af.bin` `9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0`	pdf-font-stream	PDF embedded font (cff) at offset 0x196AF	4575 bytes

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