Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e980b1816505dbe…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 51fa865a149f896df1bec957a8ff9905 SHA-1: 338a0e9bd54a8d244f54cde9c78893b4efddf8e5 SHA-256: 8e980b1816505dbeb1231c9e7304d82f181a17768f067259574adbe2a06b58c1
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that utilizes embedded JavaScript to present a fake Adobe Acrobat Updater prompt to the user. This prompt includes a call-to-action and a URL, which is then submitted via app.doc.submitForm. This indicates an attempt to lure the user into interacting with a malicious link, likely to download a secondary payload or redirect to a phishing site. The embedded JavaScript directly executes upon opening the document, leveraging the PDF's auto-open action.

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://us-api.mimecast.com.kb4.io/XTW01S2NtUmpkVVZRUW5kc1UyWm1LM3BaZFRCcU9VRklWWEJJZERWMWNXbDJOWGx3TTJoelJEZGtWRWxGUWpkSFMwdFNjRXhaYjNkdE5XZFJVelpUVlhGa1IwOHZheTlJT0Rkc05qRXJhalZKUTNoSlZtVnJPR1ZWVWswM1dVTTRWemx5THpWbUsxaG5TRUU5TFMwd2VuQkVRa1V3YjJSU1MydFRaRlk0TDJWWlRWRjNQVDA9LS00NDk3OTZmYjExMjJhNDA4NTNmZTEzMjY5ZThkZDAzZjExMjQyMzZm?cid=902167314#FDF
    • https://us-api.mimecast.com.kb4.io/XUWpFMk1FeDJVblZJYVZBeVYzQlNZalZhZGpKS1ZVazRlR2dyWjFKYVVVVXdWa1JMYkVsd01VOWxZM0UyYnk5RlJFVkRXbEZOWkUxd1prODNSRVJpTDJkNkszZ3liV3BqYkhCa2FrVmxiM0JJZFN0V1EwaEJWRVJhZVdoVFFUaFpiVEpDZWtOQ1NWaDJkV0pwVms1clRWSTBTRko0U0Rrdk9EUndka2RsYm1OVWVrdzRNVGhXWjJFeE9VbFhPVXgxVWxkWE4xaFBPVXRuTVROc1kwNU9RVWhOUkhZNGQwOWtUM0J6UFMwdGN6bGpWR0ZJYm1FNWRXdGtVR1Y1ZUdSUk5HeHRVVDA5LS1kNTc4YjdiMmIwYzY1ZGE0OTk0ZDM2YjVjMjBmODc2OWUwOTk0NTMz?cid=902167314
    • https://us-api.mimecast.com.kb4.io/XYlhabWF6TmtOelJyTUhNeFFuRTFlRGhLT1c0clZEVmtZbTlRUkRoaVExWmlZM1JCZUdGNk5qaElSbk40TkRreE0xaHhhM2c1ZEhwSFZVSXdVRmRvZWpGWWNXWXlkMlZUZUd3MU4zWkZkRUZzYURnclFqbHhhbXBsVGs0cmVVMVNWbFJXTUdWRlExUkVVbXhUWW1Gb00ycFZPVm94ZDI5V2JtSkVhSGhNTDFwQlIwRjBhbE5PYWxOR1dVZExVblZ0YW5odlJEUjFUVkpDVEhrMWVYaFZNQ3RxV2tKR2NETXZhRFZqUFMwdGRubElWbmhKYlhwVmNtTndibXM0WWpWTlkwUlBaejA5LS00NDQzZGUwYTQwNDU2ZTc1MWI4ZWQyZWI5ZmMxMDQzZTU1ZDI3M2Ni?cid=902167314
    • https://us-api.mimecast.com.kb4.io/XY0hGM1drbEJNekZDUkZwM1RDOXJXRlZFUkRreVFuUllaa014T1RsWU5IVnBXRm96ZEVnM1ZYbFlVbWhJYlM5SVpYUTJTbkJqU1c5WmJFbHBibEk0V21KUVRDdE9iRzFtV1hoQ2NubzVWelpxUTJFeU1GbzNZbVpIVjNwc2NDdHFZMFF6T1VaVmNIbHNhbWxyV21GMllsRTJka1JLVkcxNU9HeG5hVEJKYW05SkwyRnJPRlpGYzNKVFRUUm5iV1o0YUVRNFFrUkxTWE4xTkU1eVVHOWpiVnBWZURoMk5USTFLMFJCUFMwdE9UbGplVVl6VmtOR01saENRWEUzYURaR1VFVkVkejA5LS04MmUwODhhYTdhNTU5NTIxYmJhZTcwMjBkMDg3MmFiNzQxYjdjYTI3?cid=902167314
    • https://us-api.mimecast.com.kb4.io/XUWpFMk1FeDJVblZJYVZBeVYzQlNZalZhZGpKS1ZVazRlR2dyWjFKYVVVVXdWa1JMYkVsd01VOWxZM0UyYnk5RlJFVkRXbEZOWkUxd1prODNSRVJpTDJkNkszZ3liV3BqYkhCa2FrVmxiM0JJZFN0V1EwaEJWRVJhZVdoVFFUaFpiVEpDZWtOQ1NWaDJkV0pwVms1clRWSTBTRko0U0Rrdk9EUndka2RsYm1OVWVrdzRNVGhXWjJFeE9VbFhPVXgxVWxkWE4x
    • 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.

FilenameKindSourceSize
javascript_obj0012_000.js
4b7765d63a5eee2b9ed01417192ac4088e6d3cd9fd19ee30758eedd21b7abf66		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 604 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
adb4dc1bbff3d1ab61d41bfef2617610f55f36a5b7f01541ec5a9acd03dc1cc6		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103738 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001965f.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1965F 4575 bytes

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