Malicious PDF — malware analysis report

Static analysis result for SHA-256 bead408419650fa6…

MALICIOUS

PDF

41.3 KB Created: 2020-05-15 02:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba2f0b20525a51d4577e589ca19df8b0 SHA-1: 037f557f0b21e7dbd7cfb211c42c0d9598074c35 SHA-256: bead408419650fa691a2630ae28c1d25d8c39069e7bb835797c334690e056fb5
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML_NYX_PDF_MALICIOUS heuristic also flagged this document with high confidence. The document body contains garbled text and references to 'wkhtmltopdf', suggesting it was programmatically generated. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute further malicious content via the linked PDFs.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://opus48choir.com/uploads/1/3/0/7/130739368/130739368.html#serial+number+barcode+format
    • http://koshareeagleconsulting.com/uploads/1/3/0/5/130588913/318555.pdf
    • http://curtisjrdesigns.com/uploads/1/3/0/5/130551187/fevobize_veduxexom_tatobakokit.pdf
    • http://nationalcapitalbirthservices.com/uploads/1/3/0/6/130605492/guzij.pdf
    • http://retainerdashboard.com/uploads/1/3/0/4/130436390/kufigexujirokenobeto.pdf
    • http://higherimage.org/uploads/1/3/0/3/130323181/ripifupis-bosaxotujuna.pdf
    • http://solutionlogistiquetrantit.com/uploads/1/3/1/3/131398258/jabebor.pdf
    • http://cookiedelightbyjess.com/uploads/1/3/0/4/130476943/1662044.pdf
    • http://allegiance251.com/uploads/1/3/0/6/130620370/1740242.pdf
    • http://treebrook.com/uploads/1/3/0/2/130270823/eb4f705378d.pdf
    • http://hearnownola.com/uploads/1/3/1/8/131856177/maxefatugomujukidozo.pdf
    • http://kchaydenmusic.com/uploads/1/3/0/5/130543467/8a1c3.pdf
    • http://westernshoremedia.com/uploads/1/3/0/2/130289482/bisewo.pdf
    • http://stayawareart.com/uploads/1/3/0/7/130739682/zivolumavozage.pdf
    • http://heavenonearthhealth.com/uploads/1/3/0/7/130739853/zewasevu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075a1.bin
416f9a320aa13c8d3295afd9ca6373cb389da421c1389886b3bc1b3c482e96ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A1 10584 bytes

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