Malicious PDF — malware analysis report

Static analysis result for SHA-256 828bf17dbb5edd4d…

MALICIOUS

PDF

340.1 KB Created: 2015-08-28 17:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 8328aa3337bb072dc4053d4442247774 SHA-1: 557f49ec49592fbb4200d0c68d9c745378cf17c3 SHA-256: 828bf17dbb5edd4d2fee92018c34d2670c85d67fb94e8e0f405aac3a0dc39ea3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains an embedded URL that points to a known malicious redirector infrastructure. While no scripts were extracted, the presence of a malicious redirector strongly suggests an attempt to lure the user to a site for phishing or further malware delivery.

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-8794468-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8794468-0
  • 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%A7%D0%B8%D1%82%D1%8B+%D0%BD%D0%B0+%D0%B4%D1%82%D0%BF4+%D0%BF%D1%80%D0%BE%D0%B5%D0%BA%D1%82+%D1%82%D1%8C%D0%BC%D1%8B&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/7//4804/4804536_poshluye__voprosuy__kotoruye_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4804/4804412_pesni__modern__toking_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4804/4804801_skachat__foto_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00050eeb.bin
0b3b6d8638d3f06561e4e34d81899d8a92da0b2d618c616d5360e2b8fa68ac97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50EEB 7864 bytes
font_01_sfnt_off000525b3.bin
327400bc1a0e60489dabb8151056fb87a929c3269c92152e4afbb27d3e1310ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x525B3 13496 bytes

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