Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8715bd5dbdbf8b8…

MALICIOUS

PDF

42.6 KB Authoring application: PDFBox
MD5: cc81d9fea592116a595c2f0aa752ad01 SHA-1: da62d54ab2b227dd182ed4216ffc5dfe0bfe8a33 SHA-256: d8715bd5dbdbf8b812e17271e52619d9766dd6d7448cce3fbeb614b22cbab672
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The critical PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external links to other PDF files. The document body contains a mix of seemingly random text and URLs, further supporting the link farm and potential phishing or SEO spam attack pattern. No scripts were extracted from this sample.

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://kebewon.parkingcentermadrid.com/uploads/2020/01/29/mowevatixikofa.pdf
    • http://wojimbo.com/uploads/1/3/0/5/130543276/8302800.pdf
    • http://mmedicalgroup.net/uploads/1/3/0/2/130289213/2175547.pdf
    • http://realedchat.com/uploads/1/3/0/5/130543536/240379.pdf
    • http://rbcdublin.org/uploads/1/3/0/2/130273789/powazokiza.pdf
    • https://gutuwofugojo.weebly.com/uploads/1/3/0/6/130603906/acd4372.pdf
    • http://swtexasfireantcontrol.com/uploads/1/3/0/5/130551526/9538099.pdf
    • http://jug.provape.ru/uploads/2020/01/27/2599eec2dc.pdf
    • http://azzurraweb.net/uploads/1/3/0/5/130551556/4190037.pdf
    • http://xoglamaccess.com/uploads/1/3/0/6/130621046/130621046.html#juniper+qfx+switch+configuration+guide

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001385.bin
91e3e65e4136914a13964fd736d9dec8e19ea964e108c8f7ecdb00f1374a63af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385 8624 bytes

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