Malicious PDF — malware analysis report

Static analysis result for SHA-256 52032d033caf0d27…

MALICIOUS

PDF

41.3 KB Authoring application: PDF Studio
MD5: d5c78f5fb2bbc475e6f7aaaf12e71f94 SHA-1: 94ac78787796a7afa3bc7e582c85f21090fd1be5 SHA-256: 52032d033caf0d2749642b37b6cb55b6a4420cdf25897f98101de863555e35ab
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique commonly used for SEO poisoning or to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to school uniforms and academy names, suggesting a lure to disguise the malicious nature of the links.

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://riddlefamilyranchgrassfedbeef.com/uploads/1/3/0/6/130639241/lavepolof_nafoxawal_koxuveg_rabasez.pdf
    • http://kifu.master-v.ru/uploads/2020/01/28/deleguxapizabe.pdf
    • http://agavepress.com/uploads/1/3/0/5/130543386/2781241.pdf
    • http://thegreenbunnystore.com/uploads/1/3/0/6/130620251/6926227.pdf
    • http://waconda.com/uploads/1/3/0/5/130539888/f9fa352.pdf
    • http://moderngentlemanacademy.com/uploads/1/3/0/4/130435577/5278203.pdf
    • http://tinegos.trcturbo.ru/uploads/2020/01/27/jufuvisadajug_rekuju_zazuvaj_vugigebavoruri.pdf
    • http://sloansinventories.com/uploads/1/3/0/5/130550675/nurumozololo-zelabasawaditu-kazasepufug-lodekar.pdf
    • http://nachomamasbedandsnack.com/uploads/1/3/0/6/130639306/6260079.pdf
    • http://paulbutlerusa.com/uploads/1/3/0/6/130604441/650235.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/5/130590672/130590672.html#all+saints+academy+school+uniform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012e7.bin
344814e8722d0af09ad4d9a673afdb692266799dbfb6e5f274c054dd3f606266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7 8616 bytes

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