Malicious PDF — malware analysis report

Static analysis result for SHA-256 3654b3a99015e4f0…

MALICIOUS

PDF

43.4 KB Authoring application: LibreOffice
MD5: 334ee290c64873751e3e778f69c9ad05 SHA-1: 63a9b1795aeb8ba99793284a52a5c882a7170f2b SHA-256: 3654b3a99015e4f00ae13d3a1c9fe93967c93ba939df1f74ece60c1dfe30c7b1
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' explicitly identifies the mass linking behavior, with the dominant host being masonicformation.net.

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://masonicformation.net/uploads/1/3/0/8/130813307/5057111.pdf
    • http://directcashsolutions.ca/uploads/1/3/0/5/130551073/konemaxefufolup-rolen-lukasixidunolog.pdf
    • http://nataliefarrow.com/uploads/1/3/0/5/130590716/9f2fc2.pdf
    • http://katrinacjohnsonphd.com/uploads/1/3/0/5/130589400/fa0683a120.pdf
    • http://tmkfoundation.com/uploads/1/3/0/7/130775405/dc13fcae.pdf
    • http://coacharielle.com/uploads/1/3/0/4/130489467/gurewurug.pdf
    • http://phapapp.com/uploads/1/3/0/7/130775740/217308.pdf
    • http://learning-sciences.com/uploads/1/3/0/7/130738759/3931199.pdf
    • http://pottypeggyscrafts.co.uk/uploads/1/3/0/5/130540063/46d167a9f.pdf
    • http://tristanprettymanmusic.com/uploads/1/3/0/8/130814248/berilededuses_ruwarox.pdf
    • http://www.aquabluepoolspa1.com/uploads/1/3/0/6/130639092/bemazurose.pdf
    • http://alcohol-counseling.net/uploads/1/3/0/7/130776409/nekum.pdf
    • http://papomundo.org/uploads/1/3/0/5/130541624/4e4cce479f38cd.pdf
    • http://thewoodsumc.com/uploads/1/3/0/6/130603814/goguwedifetimok.pdf
    • http://mrsbyars.com/uploads/1/3/0/8/130813840/wodajuzofev.pdf
    • http://cleansweepmusic.com/uploads/1/3/0/7/130738785/wosorodupuruk.pdf
    • http://mtbgus.com/uploads/1/3/0/3/130323647/favarinizu.pdf
    • http://montbros.com/uploads/1/3/0/6/130639486/remironepuxeduti.pdf
    • http://heatherpurcellphotography.com/uploads/1/3/0/8/130814237/4600052.pdf
    • http://betterforlincoln.com/uploads/1/3/0/8/130814342/netodit_maviwuso_towesamo_ruxaruwafuwuj.pdf
    • http://gjh40.slpny.com/uploads/1/3/0/5/130539247/130539247.html#covering+letter+for+graduate+application

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004843.bin
2f8161b41e80e20a429cca3ff44c1e5abaf38f935bdad66b55cdad35ded4a33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4843 8888 bytes

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