Malicious PDF — malware analysis report

Static analysis result for SHA-256 439715378ebd5621…

MALICIOUS

PDF

39.6 KB Authoring application: Poppler-utils
MD5: 35d4573880266251278625122e1df3c2 SHA-1: b76bead9e80d87aec2d8b87731c68a3562b29537 SHA-256: 439715378ebd5621c6c606d3ec06fd95086a2b1f55a7568939b49972c2dca938
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing or traffic redirection. The embedded URLs are the primary indicators of compromise, suggesting a campaign to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://jdstom.ru/uploads/2020/01/29/tizab.pdf
    • http://top-shop21.ru/uploads/2020/01/28/jowipevemid.pdf
    • http://suxepo.canvasland.ru/uploads/2020/01/29/3188607.pdf
    • http://rimoge.shaurmoff.com/uploads/2020/01/27/6a7cb8.pdf
    • http://onlyhome.club/uploads/2020/01/29/19e468b21a064.pdf
    • http://michaelshusko.com/uploads/1/3/0/4/130476141/130476141.html#career+plan+chevening+essay+example

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001056.bin
6a9a4bb67b5df6f445529d7f506748dceb47f378b532d0d9fea54a27359c32ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056 8628 bytes

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