Malicious PDF — malware analysis report

Static analysis result for SHA-256 693281d9ef8cd765…

MALICIOUS

PDF

44.4 KB Authoring application: PDFedit
MD5: 293e1a150b33a89d20dbb9cc0e80f565 SHA-1: 12866dcc64fff90d90962c170e6e9cb97cc8c01d SHA-256: 693281d9ef8cd765d978322bc5465e856607fecfba296d52755ff66158578850
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, a technique often used for SEO spam or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or content distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://micheleyoung.net/uploads/1/3/0/4/130490386/6337933.pdf
    • http://amundsenpr.com/uploads/1/3/0/5/130539072/vuvunut_wugesatusob.pdf
    • http://vet.atlsnab.ru/uploads/2020/01/28/nepufiwutirota-pipijebaxovovib.pdf
    • http://beyondhillco.com/uploads/1/3/0/7/130776781/130776781.html#twist+of+fate+2+free
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001046.bin
7fb333fb1d477e68163bf9698e84d45091cdf3af8c0dd0c8bed1bf854545d6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1046 8820 bytes
font_01_sfnt_off00006691.bin
448c4d4550ed59c7e8e80b6d66b986666620351883d23913e38401b861762e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6691 16368 bytes

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