Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb81eff58ed7d91b…

MALICIOUS

PDF

356.5 KB Created: 2015-08-29 03:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 078e49f81c22d980e1ba20aad37188dc SHA-1: ac2558ebad8ca1ade6746610acc02d9212c679d2 SHA-256: cb81eff58ed7d91b27e97631c78428e3b6039d5b960f2aa2ed65849bc71f5cb0
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The primary malicious IOC is the URL http://botcraftman.ru/, which is likely used to host or redirect to a malicious payload. The ClamAV detection name 'Pdf.Dropper.Agent-9274884-0' further supports its role as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Dropper.Agent-9274884-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9274884-0
  • 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://botcraftman.ru/?lip&keyword=imovie+%D0%B8%D0%BD%D1%81%D1%82%D1%80%D1%83%D0%BA%D1%86%D0%B8%D1%8F+%D0%BF%D0%BE+%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D0%BD%D0%B5%D0%BD%D0%B8%D1%8E&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/7//4818/4818269_ne__boysya__ya_.pdf
    • http://img1.liveinternet.ru/images/attach/c/7//4819/4819247_skachat__akvarium__na_.pdf
    • http://img1.liveinternet.ru/images/attach/c/7//4819/4819865_kontrolnaya__rabota__po_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00054b4d.bin
ac63591e6e51e4f6a9a883f821557c57fbee4fdc09da07ac9de99a4da72ad517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B4D 8680 bytes
font_01_sfnt_off00056353.bin
eef8c7e5f724e45ea0f2fb87f9d40170966c475c189eac9af3ccc7d158d68466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56353 15096 bytes

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