Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f309db64c1ac87…

MALICIOUS

PDF

37.9 KB Authoring application: OpenOffice Draw
MD5: cc37a3108217f3d1236868fdf1bd2847 SHA-1: 36b6c08e5d3a896a9f7268cefcd79f88e1cc0899 SHA-256: 33f309db64c1ac87e96d612c4b96c02f73d42aca20f7a30267f110324475635c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF document contains numerous embedded URLs that lead to other PDF files, many of which are named with numeric slugs suggesting a link farm. The document body also contains a lure for a 'Google chrome 65 offline installer' and references external URLs, indicating a social engineering attempt to trick the user into downloading a malicious file. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amdberlin.com/uploads/1/3/0/5/130588714/3702208.pdf
    • http://evangelismseminar.org/uploads/1/3/0/6/130639215/1caea8a2d1.pdf
    • http://chicagotoeflschool.com/uploads/1/3/0/3/130379228/825039.pdf
    • http://mentesconscientes.org/uploads/1/3/0/6/130621846/ripojaz.pdf
    • http://samuel.world/uploads/1/3/0/4/130483558/1295923.pdf
    • http://clonmannoncarecentre.ie/uploads/1/3/0/6/130621836/xejisemite_vaxego_desodapezuzobo_bogivuzilidef.pdf
    • http://neobotanic.com/uploads/2020/01/28/b40f21f480dcb93.pdf
    • http://moodlabnewlife.nl/uploads/1/3/0/2/130289530/130289530.html#google+chrome+65+offline+installer

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001189.bin
45d5bae5d5ce1b6383f8a200843d758e06175bc02ce10fd1faad31c41048ceb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189 8048 bytes

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