Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2df303b21e878b…

MALICIOUS

PDF

352.4 KB Created: 2015-08-22 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: b95002844b1e905c8eee93e00fc879a6 SHA-1: 52fdb391fe5492d0a9343378c8df77c75fde0c3f SHA-256: db2df303b21e878b75aba3f5d558b045e986e555536edae5992176ff0bbd0d35
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a malicious redirector link and a high ML score. ClamAV also detected it as Pdf.Dropper.Agent-9022899-0. The embedded URL 'http://botcraftman.ru/?lip&keyword=%D0%BA%D0%B0%D0%BA+%D0%BC%D0%BE%D0%B6%D0%BD%D0%BE+%D0%BF%D1%80%D0%BE%D1%87%D0%B8%D1%82%D0%B0%D1%82%D1%8C+%D1%87%D1%83%D0%B6%D1%83%D1%8E+%D0%BF%D0%B5%D1%80%D0%B5%D0%BF%D0%B8%D1%81%D0%BA%D1%83+%D0%B2+whatsapp&charset=utf-8' points to known malicious infrastructure. The document body contains garbled text, suggesting it's not intended for human readability but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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-9022899-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9022899-0
  • 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%BA%D0%B0%D0%BA+%D0%BC%D0%BE%D0%B6%D0%BD%D0%BE+%D0%BF%D1%80%D0%BE%D1%87%D0%B8%D1%82%D0%B0%D1%82%D1%8C+%D1%87%D1%83%D0%B6%D1%83%D1%8E+%D0%BF%D0%B5%D1%80%D0%B5%D0%BF%D0%B8%D1%81%D0%BA%D1%83+%D0%B2+whatsapp&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/6//4674/4674483_prava_root_dlya_freedom_skachat.pdf
    • http://img0.liveinternet.ru/images/attach/c/6//4674/4674522_skachat_gotovuyy_server_dlya_css_v34_cherez_torrent.pdf
    • http://img0.liveinternet.ru/images/attach/c/6//4674/4674499_maykrosoft_ofis_2007_skachat_besplatno_bez_klyucha.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00053555.bin
582e8f9f1705bee1a98e5d10fb8b4e0c4771d3928fdccac4c12a2730c9fc79d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53555 9312 bytes
font_01_sfnt_off00054fb6.bin
efd25c1a1473de8eaa9d4a79209a5de45c091b65c27b2eff74676079c4b00646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FB6 16432 bytes

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