Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a5afc5c048b28e…

MALICIOUS

PDF

41.3 KB Created: 2020-03-22 11:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 739d05daa8bafbaf01f4dbbe63684fe2 SHA-1: e046d065751294ebff8054bfbdff12834b01a667 SHA-256: 75a5afc5c048b28eb008b4d47d19a9d4ae3bde07c044d23ad04203b25a80831b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, indicating it is part of a link farm or SEO spam campaign designed to drive traffic to various websites. The document body, though partially obfuscated, contains text related to 'Imagen de la energia electrica para colorear' and references wkhtmltopdf, suggesting it may be a disguised lure. The presence of numerous PDF links and the ML classifier's high confidence score support the assessment of malicious intent.

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://rktreks.com/uploads/1/3/0/9/130969211/130969211.html#imagen+de+la+energia+electrica+para+colorear
    • http://www.morganmezaltec.com/uploads/1/3/0/5/130539599/2444636.pdf
    • http://stephenjewelldesign.com/uploads/1/3/0/5/130539838/7513765.pdf
    • http://hansenfirm.com/uploads/1/3/0/6/130620451/882338.pdf
    • http://nationaldryout.com/uploads/1/3/0/4/130476709/3658509.pdf
    • http://10thirtychoir.org/uploads/1/3/0/7/130776887/1510659.pdf
    • http://desrochersculpturestudio.com/uploads/1/3/0/5/130588999/3176702.pdf
    • http://women-of-god.org/uploads/1/3/0/5/130551739/93201cff8.pdf
    • http://theholyyeti.net/uploads/1/3/0/8/130874029/wobugonir.pdf
    • http://timbercreeksawmill.com/uploads/1/3/0/2/130288447/rejebagig.pdf
    • http://davidcallanancelebrancyservices.com/uploads/1/3/0/2/130271045/kiladijijedimop.pdf
    • http://customcurtainsdirect.com/uploads/1/3/0/7/130739504/jimajul.pdf
    • http://sparkleallover.com/uploads/1/3/0/6/130603858/b30f80ac.pdf
    • http://winonastreet.com/uploads/1/3/0/6/130639318/4928114.pdf
    • http://www.melbournecaulkingservice.co/uploads/1/3/0/3/130379087/9848055.pdf
    • http://kempha.com/uploads/1/3/0/5/130548192/5946151.pdf
    • http://haagamattressutah.com/uploads/1/3/0/2/130288522/mofexusa-robumiw-sububu-ratinon.pdf
    • http://mesquitesitting.com/uploads/1/3/0/5/130551257/2466773.pdf
    • http://integritymke.com/uploads/1/3/1/0/131071095/7292384.pdf
    • http://riversplusguiding.com/uploads/1/3/0/2/130289377/zusep.pdf
    • http://thehalalzone.com/uploads/1/3/0/6/130605381/ee87267bc.pdf
    • http://www.intrepidprogramme.com/uploads/1/3/0/5/130588517/fafisar-rebirudiw-ranudanetu.pdf
    • http://mail.motnik.net/uploads/1/3/0/8/130813922/6058136.pdf
    • http://74-123-73-100.mgwnet.com/uploads/1/3/0/2/130289292/fuvipas.pdf
    • http://hairremovalbicester.co.uk/uploads/1/3/0/8/130874289/debukinowikirol.pdf
    • http://thebeautyshed.net/uploads/1/3/0/4/130489080/2084165.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_off0000742d.bin
447b1af012cd5145ee14b732b5363a101c561d4bf27ecf9d626ad3aa6254b568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 9172 bytes

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