Malicious PDF — malware analysis report

Static analysis result for SHA-256 633e45668c0b50ea…

MALICIOUS

PDF

10.3 KB Authoring application: Cpsfvpundgma Xtguvomuxdb First seen: 2015-09-30
MD5: 92bad47b13d700934464a33b8b8d4350 SHA-1: eadf9deea2fd26bce9e671cec2b2fe369a3ef19b SHA-256: 633e45668c0b50eaee8b53b1f155852034a5c6dde1f3e24cedbf934e4668f631
72 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a malformed stream and an embedded script payload, strongly indicating exploitation. The ML classifier also flagged this PDF as malicious with high confidence. The embedded script likely downloads and executes a second-stage payload from the URL http://readsiteurl.com/UNEyTr0Xx0D0ZO5A0aPXQ0fS8a0YB0d00fKN0Z7RB0MKQF0nwNv00uzC02l8j10krI0IKIi0xgbS0ev5s0jD7602Ag50NX9O12LIn0jVlV0wLVV032lk15Iza0nEIw002cd0eyT60BLG00Dqu20lVfa0kDAy0OaqI0oDCE0x1h40MmCE0X8Go0iHKX0qRn00rCyM0hBe2/getmyfile.exe?o=1".

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream info 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.
  • 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://readsiteurl.com/UNEyTr0Xx0D0ZO5A0aPXQ0fS8a0YB0d00fKN0Z7RB0MKQF0nwNv00uzC02l8j10krI0IKIi0xgbS0ev5s0jD7602Ag50NX9O12LIn0jVlV0wLVV032lk15Iza0nEIw002cd0eyT60BLG00Dqu20lVfa0kDAy0OaqI0oDCE0x1h40MmCE0X8Go0iHKX0qRn00rCyM0hBe2/getmyfile.exe?o=1&quot;;function In PDF document text
    • http://readsiteurl.com/UNEyTr0Xx0D0ZO5A0aPXQ0fS8a0YB0d00fKN0Z7RB0MKQF0nwNv00uzC02l8j10krI0IKIi0xgbS0ev5s0jD7602Ag50NX9O12LIn0jVlV0wLVV032lk15Iza0nEIw002cd0eyT60BLG00Dqu20lVfa0kDAy0OaqI0oDCE0x1h40MmCE0X8Go0iHKX0qRn00rCyM0hBe2/getmyfile.exe?o=1&quotIn PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x36A 9494 bytes
SHA-256: fed57a6be6cd77221613c3d454df790cfa31d5c5a63e6955006f6a11b4127b16
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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