Malicious PDF — malware analysis report

Static analysis result for SHA-256 534c335b0a77ab5c…

MALICIOUS

PDF

42.7 KB Authoring application: OpenOffice.org
MD5: d5a4562a17efa997819f6ed74db4c605 SHA-1: fac8616cb57de18dff942cb56341fcfbf0a64c93 SHA-256: 534c335b0a77ab5c45abbbf8d5969ea8f559e66fc14b1b3ce8b617e7dd75c9c5
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. This is strongly suggested by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The document body text, though partially corrupted, appears to be a lure related to 'grade 5 worksheets'.

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://superyachtcharterfleet.com/uploads/1/3/0/2/130287313/9011187.pdf
    • http://10dayfilm.org/uploads/1/3/0/6/130639510/99643e0275653.pdf
    • http://skylighthk.com/uploads/1/3/0/6/130639933/fabodex.pdf
    • http://uxwcdconference.com/uploads/1/3/0/8/130814254/rasumipepuzovivezo.pdf
    • http://balance-your-nutrition.ca/uploads/1/3/0/8/130874613/dd4b9bde7ceeb3.pdf
    • http://mollybrave.net/uploads/1/3/0/7/130776201/2879730.pdf
    • http://deborahschoch.com/uploads/1/3/0/6/130620395/zozurulakefoloz.pdf
    • http://crossbraced.consulting/uploads/1/3/0/5/130590469/zigasuxagapatifa.pdf
    • http://auscorruption.exposed/uploads/1/3/0/8/130814909/nusogusiga_mitesevufiro_wewutova_kokusijoburav.pdf
    • http://shadowslabyrinth.com/uploads/1/3/0/6/130620759/652f5b2a56911b9.pdf
    • http://jonnyspartay.com/uploads/1/3/0/5/130589229/a063e.pdf
    • http://hostmaster.illustrioustees.com/uploads/1/3/0/2/130289519/kanebakelusimet_wamofupud_libefipatiku_nomirepogokopas.pdf
    • http://mobilestagehire.com.au/uploads/1/3/0/6/130620505/6497268.pdf
    • http://ryan-mckenzie-se-1.rominastiebenphotography.com/uploads/1/3/0/9/130969329/130969329.html#mathematics+grade+5+worksheets+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000036d7.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36D7 16204 bytes
font_01_sfnt_off00004e9f.bin
9976466a0a4b11f7065ec794c59c10aa642483f20ce1c96df760d615ebe31700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9F 7672 bytes

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