Malicious PDF — malware analysis report

Static analysis result for SHA-256 5250182555c9fa07…

MALICIOUS

PDF

41.7 KB Created: 2020-03-21 16:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a44f35b0fa7bad345cea63d5eecbefb SHA-1: 15b9d61fa90d2a1a6cb3fb32d779498c9ff103fa SHA-256: 5250182555c9fa0770031c29d5f77dfd4c9da46ec31cc225588edb2058a3ab77
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. The ML_NYX_PDF_MALICIOUS classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a wide array of other PDF documents hosted across different domains, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

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://estudio-thuban.com/uploads/1/3/0/6/130639226/130639226.html#que+es+el+aprendizaje+cognitivo+social
    • http://aadinelectric.com/uploads/1/3/0/5/130589429/6201451.pdf
    • http://photobros.org/uploads/1/3/0/8/130874652/duzixixikedebi-gidivofibewako.pdf
    • http://beauty-by-bree.net/uploads/1/3/0/7/130739729/1395740.pdf
    • http://mitchellkim.net/uploads/1/3/0/2/130289736/8a7fea6357.pdf
    • http://le7emepeche.net/uploads/1/3/0/6/130622120/tefixuxebamiput.pdf
    • http://spaceworx.org/uploads/1/3/0/5/130588966/391409.pdf
    • http://www.topinternationalexchange.com/uploads/1/3/0/6/130603818/piwujemubo.pdf
    • http://comfortablechristianity.com/uploads/1/3/0/2/130289244/3717612.pdf
    • http://igy6veteran.com/uploads/1/3/0/3/130379087/piloxagukugiti.pdf
    • http://hostmaster.francinesflowers.co.uk/uploads/1/3/0/7/130775346/jewafuxixurewituzogi.pdf
    • http://harecutz.net/uploads/1/3/0/5/130544541/tirawubejizuxotubojo.pdf
    • http://nabj.uga.edu/uploads/1/3/0/4/130435757/255b5b0d4ad.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_off00007993.bin
96907ebb70ee17cf2cb2dcf41a5dcb9410a28253eb34b3a2cf6e14d84bb4d626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7993 8328 bytes

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