Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e78c783d2ba1586…

MALICIOUS

PDF

44.2 KB Authoring application: GIMP
MD5: f611954e8c8becc02bb8f2d217e09721 SHA-1: 8a0f78f90cbb13751f6ddb3c0d7bb622626127ab SHA-256: 6e78c783d2ba15869952634e08b70d400c313d0a0a3e38124acb6ae7eaa346b7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, a technique often used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs suggest a link farm designed to obscure the ultimate destination or to spread malicious content across multiple domains.

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://mynumba.com/uploads/1/3/0/6/130639183/8404753.pdf
    • https://xumejefov.weebly.com/uploads/1/3/0/3/130313555/389109.pdf
    • https://zipomizadexaj.weebly.com/uploads/1/3/0/5/130539912/nirabuxe-kiwesozo.pdf
    • http://mrsleonard2ndgrade.weebly.com/uploads/1/3/0/2/130272610/9308749.pdf
    • http://ndhumanities.com/uploads/1/3/0/6/130604090/zuganalujekuvojibeli.pdf
    • http://vet77.ru/uploads/2020/01/27/08d55ca91.pdf
    • http://tuzuzejubo.baksmans.club/uploads/2020/01/27/dutosadegoxamujuwus.pdf
    • http://psychowizards.com/uploads/1/3/0/4/130435556/d9097f6c933e.pdf
    • http://nep.perabet76.net/uploads/2020/01/28/litavove.pdf
    • http://starlightbooklets.com/uploads/1/3/0/3/130323164/8892930.pdf
    • http://customer-day.azzure-it.com/uploads/1/3/0/2/130288427/130288427.html#causas+y+efectos+de+la+desercion+escolar

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001255.bin
b2a79a9e569b431f2f351743c1604b2b341a6a1290d89ba9c1bf401e2878c19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1255 8936 bytes

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