Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b9c421fa424581…

MALICIOUS

PDF

78.3 KB Created: 2010-02-23 12:29:53 -08:00
MD5: 157d3e687d799fd7ae3d2cca5e93553e SHA-1: f5aea08e590134c17a7967379ce8a540d7f16b68 SHA-256: 52b9c421fa424581da8acd7250405db21cfce82f7319ce54dea5021c8100678a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including an image-only document with an action trigger and a small file size, suggesting it's designed to trick users into clicking. It contains embedded JavaScript and an embedded file, which are common techniques for delivering malicious payloads. The presence of PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic indicates a script payload was found within a PDF stream, likely intended to download and execute a second-stage payload.

Heuristics 8

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 1 text block(s), carries a click-outward action, and is only 78 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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)
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
  • 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 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/pdf/1.3/

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0002.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x19FA 85 bytes
embedded_file_obj0003.bin
0cae1494b9c99505bf126e683a1a8be36bc8d5e793ab829e266d6e2fd62ccac3		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x1AAC 1466 bytes
embedded_file_obj0004.bin
1b57e7c1e4bc1f8daf7cdf9c6223b19580c93789063a99232ed1cb040470df13		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1D6B 9148 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
embedded_file_obj0005.bin
f47c3dc8c4eeb64abc2cc332be719add15af6ce6dfdcdb477c08a1aefdbe7477		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x290F 11740 bytes
embedded_file_obj0006.bin
226eeacc5eecef2a05ca480f144ff6936594e20b5c7672e8f29f25c8bea65a56		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x2AD7 2928 bytes
embedded_file_obj0007.bin
4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x2E44 200 bytes
embedded_file_obj0008.bin
d51b9fc28b592405fb598e711d1495e1421571073bc2e8542d55389768716c06		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x2F37 835 bytes
embedded_file_obj0009.bin
e65f1e07bc965092b3153e64a1e8777a909cc47a98c0e2a10d38c47def2e6652		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x3110 291 bytes
stream_002_off000003e1.js
f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E1 1532 bytes
stream_003_off000005cc.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5CC 870 bytes
stream_008_off0000112a.bin
8358d835225babc82acbcbbf2cb07512b8fb3772c5b46ff5956d2c6d02da8c39		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112A 3024 bytes

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