Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9a1c4a8b1426e5…

MALICIOUS

PDF

37.5 KB Authoring application: LibreOffice
MD5: ede7a724408938e34811c3324c2f25f2 SHA-1: 893caf2dad6e8e34d1d7d5a94488038e1f5bda31 SHA-256: bc9a1c4a8b1426e518375cf1ef3afa17712189a7fa54b17f0caeb1060ce152f6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs likely serve as a redirection mechanism to deliver further malicious content or phishing pages.

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://101redirect.com/uploads/1/3/0/5/130546497/9055309.pdf
    • http://catalog.koehlerscale.com/uploads/1/3/0/2/130272280/2789289.pdf
    • http://longlifetherapy.com/uploads/1/3/0/3/130323620/kinux.pdf
    • http://xexi.aspirantesmedicina.com/uploads/2020/01/29/2741144.pdf
    • http://proxyregister.com/uploads/1/3/0/2/130289198/78efe848da0d.pdf
    • http://nicknewmont.net/uploads/1/3/0/6/130639905/limumekodipunumel.pdf
    • http://dogodogo.ru/uploads/1/3/0/6/130604860/rofalapowefanidika.pdf
    • http://325986690869568534.com/uploads/1/3/0/3/130323603/reremenabu.pdf
    • http://miracleinabucket.com/uploads/1/3/0/6/130605306/130605306.html#letter+m+coloring+pages+for+preschoolers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011c6.bin
18238de245880c6749b9194337c101e9ef235b907e0e0b12da93c3c407b5b9af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6 8424 bytes

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