Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e5018db2b7911f…

MALICIOUS

PDF

42.8 KB Authoring application: OpenOffice.org
MD5: 0437c0520d803efd7c76f3a882522c0c SHA-1: c521739efb6478eefd5e2b687c689bf0ad31746a SHA-256: d0e5018db2b7911fd594e88c5f47741cd8dbd0063d4c0c0e4644ee2404a0163c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body itself is heavily obfuscated and does not provide clear user-facing text, but the heuristic 'PDF_SEO_LINK_FARM' directly identifies the mass linking behavior.

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://besunadolo.kovriki.online/uploads/2020/01/29/3956358.pdf
    • http://aflqua.com/uploads/1/3/0/8/130814024/d8389eef.pdf
    • http://ezekius.net/uploads/1/3/0/5/130541641/d8226.pdf
    • http://internetarchitect.net/uploads/1/3/0/3/130379928/zobanetazojo.pdf
    • http://nmisria.com/uploads/1/3/0/5/130538939/zibosesis.pdf
    • http://mitchcapone.com/uploads/1/3/0/2/130289523/jugubarij.pdf
    • http://connectnumbers.com/uploads/1/3/0/6/130620700/4469676.pdf
    • http://nakedbl0ndeee.com/uploads/1/3/0/5/130550713/d1e7278fe037.pdf
    • http://newenglandgirlsnpl.com/uploads/1/3/0/6/130604045/dojosuxolezaw_raxemalesakuwo_judiwoxolepif_zosubeso.pdf
    • http://cornerstoneoutdoors.weebly.com/uploads/1/3/0/5/130551144/fexujajej-xexako.pdf
    • http://benipug.metrika.agency/uploads/2020/01/28/5263128.pdf
    • http://stokesed508webpage.com/uploads/1/3/0/6/130639975/130639975.html#purnell%27s+history+of+the+first+world+war+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001327.bin
51c9e595b7b5c8d4a31b0d5da5e4e3291818017530d02af4886173d92f524883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327 8752 bytes

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