Malicious PDF — malware analysis report

Static analysis result for SHA-256 64438c53faf35de1…

MALICIOUS

PDF

38.5 KB Authoring application: Smallpdf Desktop
MD5: 0b8c42d387e519408ebb377197146fbf SHA-1: 31cf966a9fda23d706ed6d5e82428ad3ce458215 SHA-256: 64438c53faf35de16f344c4ad763f55709bd840336730e1233486321dfcfa8c0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external PDF files, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and the ML classifier output strongly indicate malicious intent. The embedded URLs likely serve as a mechanism to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ailesburylite.com/uploads/1/3/0/4/130477201/tixikinadaja.pdf
    • http://nycartsed.com/uploads/1/3/0/4/130476395/9b10ecb333.pdf
    • http://beleeflaos.be/uploads/1/3/0/3/130379528/7fcc1a3dad.pdf
    • http://newparanormalsociety.com/uploads/1/3/0/5/130540789/fosexa.pdf
    • http://bransfordmedpsych.com/uploads/1/3/0/4/130436089/2441762.pdf
    • http://us.momotombochocolatefactory.com/uploads/1/3/0/5/130551160/130551160.html#hold+the+line+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001017.bin
833a57896eae1053ccf38ebc1695cadeb952871d5a760c54d5f8f6e150aa7193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017 9468 bytes
font_01_sfnt_off00005db5.bin
84340d81b687e5658134e86d602934373e4edb1358290f916b35b324124d256a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB5 2696 bytes

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