Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de177650350b6f3…

MALICIOUS

PDF

365.5 KB Created: 2015-08-27 09:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 44cb24efc441a81a84960e13fda99fb7 SHA-1: 7fd5a36b9325095ef94a2319cfbe6bd617c3727b SHA-256: 5de177650350b6f3355fb4edf05b94d5aa62593c011bf964ef30b234367a0d1c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating it is a known dropper. A critical heuristic firing confirms the presence of a PDF link to known malicious redirector infrastructure at http://botcraftman.ru/. Although no scripts were explicitly extracted, the PDF structure and the malicious link suggest an attempt to lure the user to a compromised site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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-9021794-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9021794-0
  • 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=nokia+5530+xpressmusic+%D0%BF%D1%80%D0%BE%D1%88%D0%B8%D0%B2%D0%BA%D0%B0&charset=utf-8
    • http://img1.liveinternet.ru/images/attach/c/7//4771/4771864_asus__x55a_.pdf
    • http://img1.liveinternet.ru/images/attach/c/7//4771/4771826_vera__polozkova__i_.pdf
    • http://img1.liveinternet.ru/images/attach/c/7//4771/4771922_programmuy__dlya__nokia_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000568a7.bin
637a799344e472f1f9bb83ad580b89c6ddf49889a2dcb482e11bd163678fce84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568A7 10616 bytes
font_01_sfnt_off000585d8.bin
d4f79d1d9d8fe7df84cd5944899c1ddad7ed1767a52b2b89d8912bd7f1ae93df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585D8 16288 bytes

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