Malicious PDF — malware analysis report

Static analysis result for SHA-256 db67f6f6d0c12763…

MALICIOUS

PDF

37.7 KB Created: 2020-06-01 04:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beabffcea7fe3763d6d50e0772002976 SHA-1: dbffcf3347c3c3122f3d293860add6d64d3fed3b SHA-256: db67f6f6d0c1276376f7c641a7d454420b172a9b9ce47a4cf0a5695092c25694
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a common technique for SEO poisoning or redirecting users to malicious sites. The document body mentions a 'study guide for sale', which is a lure to encourage clicks. The heuristic PDF_SEO_LINK_FARM indicates a mass link farm, and the ML classifier strongly suggests maliciousness. The primary malicious URLs are identified as IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kapserenite.com/uploads/1/3/0/4/130476499/130476499.html#dr.collins+pcat+study+guide+for+sale
    • http://mphsdemocrats.com/uploads/1/3/0/5/130589409/zomezezexuxe_vudoligis_fajafopazoka.pdf
    • http://thememeoutlet.com/uploads/1/3/0/7/130775119/rapadokilen-jazudinel-tujobufeseluw-zulel.pdf
    • http://skindeepbeautyestheticsbycyndi.com/uploads/1/3/1/4/131437476/b7a905.pdf
    • http://zyilzbidrpsp.yucatancustomfurniture.com/uploads/1/3/1/4/131483520/5807860.pdf
    • https://guremev.files.wordpress.com/2020/05/91336048057.pdf
    • https://xoxabolagiw.files.wordpress.com/2020/05/sajuwelobipadejes.pdf
    • https://muxidawumub.files.wordpress.com/2020/06/52247085192.pdf
    • https://semigumita.files.wordpress.com/2020/05/68371564878.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_off000066b5.bin
cd1034ae147764854c959f514f5f15c95f587a6fb476ceb9e297c084393ecf54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 10332 bytes

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