Malicious PDF — malware analysis report

Static analysis result for SHA-256 858b4cadc36d2870…

MALICIOUS

PDF

384.8 KB Created: 2015-08-22 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 396de62bdef839755523df400f979f36 SHA-1: 13dc9d5d0e9a61f5d5abfea1920361985622b18a SHA-256: 858b4cadc36d2870b0331a7b5219f7081fc611eb044b42e93de919244153b920
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical finding for a malicious redirector link to 'botcraftman.ru'. An ML classifier also strongly indicated maliciousness. The ClamAV detection 'Pdf.Dropper.Agent-8900350-0' suggests the file is a dropper designed to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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-8900350-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8900350-0
  • 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=%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B0+%D0%BF%D0%BE+%D1%84%D0%B8%D0%B7%D0%BA%D1%83%D0%BB%D1%8C%D1%82%D1%83%D1%80%D0%B5+1-4+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%84%D0%B3%D0%BE%D1%81+%D0%BB%D1%8F%D1%85&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/6//4676/4676805_programma_dlya_oformleniya_fotografiy.pdf
    • http://img1.liveinternet.ru/images/attach/c/6//4675/4675786_opera_mini_dlya_tele2_skachat_besplatno_na_telefon.pdf
    • http://img1.liveinternet.ru/images/attach/c/6//4675/4675543_skachat_kms_aktivator_dlya_windows_7_maksimalnaya.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005b6b5.bin
c8a2e130d6bbbb70f5b77c1fbeba3dbc21cd3bc99d9f9911260e6821066fa1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6B5 9924 bytes
font_01_sfnt_off0005d213.bin
93773b7d80bd1b444c0fec803031f6d52d31956902e7ad1a9555b76f6a7d74a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D213 15696 bytes

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