Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79f89783cc9c4e9…

MALICIOUS

PDF

38.8 KB Authoring application: PDFBox
MD5: 27cf7ec6e6621b52493994c4bd9a8af1 SHA-1: f7b0967af32c9085567b7861c2d79228a24d7e66 SHA-256: e79f89783cc9c4e99eedd32f117c9feb31314d7035341fcd4202f01869cef188
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.TtraffRobotInstall-7605656-0 and a machine learning classifier. Static analysis revealed a significant number of external links, indicating a link farm designed to direct users to other potentially malicious PDF files. The embedded URLs are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rentsfnow.net/uploads/1/3/0/5/130543006/degoruviwokazot.pdf
    • http://fiz.kformacion.com/uploads/2020/01/29/5658138.pdf
    • http://mycarlrogers.com/uploads/1/3/0/2/130288502/xozirawedabe.pdf
    • http://nyctoursandattractionsgroup.com/uploads/1/3/0/6/130605501/modumon.pdf
    • http://anjaliseries.com/uploads/1/3/0/6/130639835/47b6d8f00fe.pdf
    • http://bartbenson.com/uploads/1/3/0/6/130620910/495579.pdf
    • http://casaserracines.weebly.com/uploads/1/3/0/2/130291624/8617365.pdf
    • http://fuxoxuniro.tanglamstore.com/uploads/2020/01/28/riroxajufogulurikume.pdf
    • http://cemento-stampato.org/uploads/1/3/0/2/130274282/5132847.pdf
    • http://djsacademy.com/uploads/1/3/0/2/130291552/130291552.html#edexcel+igcse+biology+paper+2+2019+student+room

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000121b.bin
41f4b94b6dd91db4a7355049ea2356ef5dbe150f6a21cd12d2a68ef007a2465b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B 8476 bytes
font_01_sfnt_off00005d1d.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1D 1708 bytes

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