Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed822436a3fd7f7…

MALICIOUS

PDF

39.7 KB Created: 2020-03-24 03:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10eb644ce6317bdafe81a8bd55819d48 SHA-1: 2499aaa8945e4c4abb43b46fcbf554aaf183d563 SHA-256: eed822436a3fd7f7d442d99c84ddad6306b8e298253c3dad1ce5d04936dc984d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'Sparknotes sophocles the oedipus cycle' and 'wkhtmltopdf', suggesting a lure or obfuscation tactic. The primary attack pattern involves directing users to a network of suspicious URLs.

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://blockchainambassador.ca/uploads/1/3/0/5/130539309/130539309.html#sparknotes+sophocles+the+oedipus+cycle
    • http://gfiteducation.com/uploads/1/3/0/5/130589243/tekupixepa.pdf
    • http://animeconcarne.com/uploads/1/3/0/6/130604026/fepubutipubiwi.pdf
    • http://www.belgianundergroundbrewing.com/uploads/1/3/0/5/130588651/1328144.pdf
    • http://whatrefund.co.nz/uploads/1/3/0/7/130776366/vixibuzefuveliz.pdf
    • http://hotpinkbuttafly.com/uploads/1/3/0/7/130775853/guxibopef.pdf
    • http://www.mrscardenas.com/uploads/1/3/0/8/130874139/rimov-kepawix-xutumide.pdf
    • http://tyler47.com/uploads/1/3/0/4/130435532/dosatojokefabi.pdf
    • http://lucasnileweaver.com/uploads/1/3/1/1/131163740/bemewupumanume.pdf
    • http://applicationpromoter.com/uploads/1/3/0/2/130272233/0d555dd.pdf
    • http://www.kimblynehenrydesigns.com/uploads/1/3/0/4/130483546/67cc0b.pdf
    • http://rkfilters.net/uploads/1/3/0/6/130621487/koritenorajen_tebusefa.pdf
    • http://rrrtag.com/uploads/1/3/0/3/130379069/95e0f.pdf
    • http://silhouettemedispa.com/uploads/1/3/0/4/130435985/b8e0d0553.pdf
    • http://interiordecoratorsanddesignancaster.com/uploads/1/3/0/8/130813644/afb024.pdf
    • http://mzphysics.com/uploads/1/3/0/7/130738700/bfceefe.pdf
    • http://www.minimographics.com/uploads/1/3/0/9/130969432/5891996.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_off00007214.bin
d4a6d5141681980324abc720f709ac865c9aa4c7a6160c5d66d35631b7c859f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7214 7660 bytes

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