Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ec4a6ed341e5b6…

MALICIOUS

PDF

98.9 KB Authoring application: Mobipocket Creator
MD5: 56420cd8506faa2cbce1474c34b4dffa SHA-1: a5334559f741aa02ca93817c578d39a6bd722b77 SHA-256: 65ec4a6ed341e5b66678c2c53ae0d0d1978d59685a922384a0e7ab310930f87d
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with 16 links pointing to various PDF files hosted on different domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the embedded links themselves serve as the primary attack vector, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://thelegalmastermind.com/uploads/1/3/0/6/130605292/nowipinobapinonir.pdf
    • http://michaelmkrueger.net/uploads/1/3/0/5/130544898/2457f7.pdf
    • http://brazilian-samba.com/uploads/1/3/0/6/130605344/lijetadebimimolasoju.pdf
    • https://mazolaguvoka.weebly.com/uploads/1/3/0/6/130604045/9252878.pdf
    • http://mkwritingsolutions.co.uk/uploads/1/3/0/6/130639305/9177037.pdf
    • http://konect2us.com/uploads/1/3/0/4/130489248/9938346.pdf
    • http://thepipcup.com/uploads/1/3/0/6/130605149/d292030b6e9.pdf
    • http://szconstructionweimartx.com/uploads/1/3/0/6/130620679/aec9766b6f9.pdf
    • http://colddiamnd.com/uploads/1/3/0/5/130543262/130543262.html#engineering+economy+16th+edition+sol
    • 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_off00001393.bin
6fb8e838e25cb71d86846f3aa62a805d51705bb68bbd17875c0517c13b8ab818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1393 10576 bytes
font_01_sfnt_off0000bd4d.bin
9d747930df910d1b16f6aeae13eefb5503aa50145f1894bb37f8e7b711430b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4D 2856 bytes

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