Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c01aadd5a16644d…

MALICIOUS

PDF

5.3 KB Created: 2010-04-23 06:59:32 Authoring application: Dakmiyfomimaba
MD5: 8092c4fc47531f2fa0ef015abe11149e SHA-1: 99d982d8edc71bb756f08ecab3e45e90db657cb7 SHA-256: 8c01aadd5a16644dd88f20838d27c0487f65e27320c857c6d43e64a7c461171d
96 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_PAGE_WORD_XOR_EVAL_STAGER heuristic indicates a stager mechanism, and the PDF_UNESCAPE heuristic suggests obfuscation. The JavaScript attempts to load an external script from 'http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=' which is likely malicious. The document body contains repetitive, nonsensical text, possibly as a lure or to obscure the malicious content.

Heuristics 5

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER
    PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
  • 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.
  • 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://ads.doclix.com/adserver/serve/js/doclix_synd_overlay.js
    • http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0010_000.js
77692aa6eee912f470430c71119e8b9c8ba346a577cd63ae147470c7ef4ca3c3		 pdf-javascript-stream PDF /JS object 10 at offset 0xC9D 896 bytes

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