Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bdfc327c9ad6b5…

MALICIOUS

PDF

80.0 KB First seen: 2024-06-17
MD5: fbb50eeb1b96c5e00796950c4d999986 SHA-1: dd91766c78c9888a5e94e18839f59d462d878ecd SHA-256: 74bdfc327c9ad6b599695f30ae4609af5140e253d4e88f88cc059870bc535379
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded JavaScript that is automatically executed upon opening. This script is designed to present a fake Adobe Acrobat update prompt to the user, acting as a lure. The primary goal is to deceive the user into clicking the prompt, which then directs them to download a malicious payload from one of the identified external URLs.

Machine Learning

  • Nyx PDF Classifier clean score 0.0005

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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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://www.dynaforms.com
    • https://mazcdn.studiwag.top/bowRuxFV
    • https://34.75.2O2.lOl/XTURkSFZ6TldTVGsxVG5KUFZ6YzVXaTlIWm5OS1UzTmljMmxJVjJ4SGNFOUxaMDVyUTNabFF6VndWMDUwTTNKMVVtWnVhMjFEVmxkd2VsQnZWRkp5ZUhaa2VpOXlRVGw1UjJ0UGFFRnVPV1ZUT0U1bGJYTkJaM3BRZVRWRmRqZGtVSGhzZEdoNGJWZ3JTMmM5TFMxUWJXRm5MMjVsTkRaaFMxaGpjUzlQV2xwYVIyUjNQVDA9LS00NDdhYTdmZTBhNDk2MGQ2NzU1ZjUxYWRiNDI2OWQ4MjdmNmY4ZjRl?cid=1266908717#FDF
    • https://mazcdn.svcfree.buzz/PaDlQmcu
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • https://www.example.com
    • https://workonwheel.ac-page.com/s
    • https://sharedfiles.ac-page.com/s
    • https://workonwheel.ac-page.com/no
    • https://workonwheel.ac-page.com/ss

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_013_off00012e28.js
340570d67415ae35ea022c13049d9fecc92603108904c0157dae688c243a74a8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E28 592 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
objstm_0048_00.bin
40769e7aa0eb39ffca3dda5b7ca1a3c1c2e737abf1638230441b60a38dac1e67		 pdf-objstm-decoded PDF /ObjStm 48 0 obj (inflated) 9254 bytes
font_00_cff_off00000638.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x638 4575 bytes

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