Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c85e4fa576c7bf…

MALICIOUS

PDF

48.5 KB Authoring application: pdf-parser
MD5: 34af4cc255eef51c450b069cb9a11478 SHA-1: cb4975603a96e313cffc61dcf93392d9ceadc75d SHA-256: a5c85e4fa576c7bf9bb0de8f9ddc74f5b6ed25e3127c2c58f7f665baf12fc91a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest a link farm designed to direct users to potentially malicious content or for SEO manipulation. 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 https://bekezefaxakad.weebly.com/uploads/1/3/0/5/130545954/wuxomolixef-rikenanivig.pdf
    • http://strongesthvaccleaning.com/uploads/1/3/0/2/130289186/bb96a8676a6.pdf
    • http://nateveorganic.com/uploads/1/3/0/6/130621003/vipevojutifol.pdf
    • http://saltcitysoccer.com/uploads/1/3/0/6/130639841/dcd160011f9888.pdf
    • http://nuthoppers.com/uploads/1/3/0/3/130313702/dopumi_vamamobasasos_koloxul_teguligetaf.pdf
    • http://derekfordportfolioshsu.com/uploads/1/3/0/5/130588343/larumidi.pdf
    • http://sweetlyavas.com/uploads/1/3/0/4/130489226/gepixarevaxix_fowuvojulusix_japukotox.pdf
    • http://mynaturalhairspa.com/uploads/1/3/0/3/130313056/130313056.html#georgia+kendo+association

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011d9.bin
14365f3dc578d918d87731e677358f18ba4b2489df0fe495e864bc9e4fddfe88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9 8684 bytes
font_01_sfnt_off00006864.bin
05e27b3c260c6f7f5c0aced478ef3d6d906f9da5fc1c1c1655a779232c828be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6864 5052 bytes
font_02_sfnt_off000077d5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D5 16036 bytes

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