Malicious PDF — malware analysis report

Static analysis result for SHA-256 60393bd70c498d88…

MALICIOUS

PDF

42.5 KB Created: 2020-03-26 14:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb232d80ec2030c74f8bbe0ac6e32a02 SHA-1: 1d1464230e949e72ec3a28461d1dcaf97b81c5b0 SHA-256: 60393bd70c498d8851698a7f473833f0c4ccd4ca5d53efddfce36c2bc794f808
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, and the document body is largely unreadable, but the heuristic firings point to a malicious intent to redirect users to a network of external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://revolutionpoledance.com/uploads/1/3/0/2/130289338/130289338.html#antecedentes+personales+patologicos+y+no+patologicos+pdf
    • http://cindybettinger.com/uploads/1/3/0/5/130543210/pozamevoku.pdf
    • http://hostmaster.fromagarden.com/uploads/1/3/0/5/130590126/dufejamatinen-wotudaz-pimoteronasaj-ruxonun.pdf
    • http://rosaxios.art/uploads/1/3/0/9/130969685/fubetugejowi.pdf
    • http://www.photographybytarawynnedougherty.com/uploads/1/3/0/4/130493389/foserojupat_nexisofa.pdf
    • http://help-hope-geo.org/uploads/1/3/0/6/130603903/pinibafot.pdf
    • http://petfolder.net/uploads/1/3/0/6/130622053/27bafe.pdf
    • http://ukiahrvpark.com/uploads/1/3/0/5/130589297/zusibudabalol_xavevuxexupugu.pdf
    • http://teambuildingingeorgia.com/uploads/1/3/0/6/130621004/27f4a6b8b7cae04.pdf
    • http://kirstainmcardle.com/uploads/1/3/0/3/130323405/f815450fda6f.pdf
    • http://biswajit.com/uploads/1/3/0/8/130874474/zajed-zewotolewigol.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/
    • 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_off00006645.bin
a033d8eca3745377411f5e5f69c85fb4b253c62b648e8cdbbee7db47b82f4676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 9320 bytes
font_01_sfnt_off0000878d.bin
fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x878D 16064 bytes

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