Malicious PDF — malware analysis report

Static analysis result for SHA-256 de12b9665def71b9…

MALICIOUS

PDF

74.1 KB Created: 2020-03-10 10:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5f10f1be7fe9b4f9ff3567a22191e49 SHA-1: 8cab875445209a8b631179e7c8c790a4c284bc50 SHA-256: de12b9665def71b9e49887da76a19701fcac428a34c0675ec567c82f20ef2dfd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The primary URL points to a page with a medical-sounding title, likely a lure. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common delivery method for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://host80.carmichaelnl.com/uploads/1/3/0/7/130740210/130740210.html#acute+renal+failure+mechanism+of+action
    • http://tijuanadragones.com/uploads/1/3/0/6/130620290/mexoxazejutulogukure.pdf
    • http://summerforindiana.org/uploads/1/3/0/7/130738680/5296757.pdf
    • http://familyfriendsgroup.com/uploads/1/3/0/8/130874517/88f7bd360.pdf
    • http://bengalpoker.com/uploads/1/3/0/8/130874426/wafipefixapuwijijux.pdf
    • http://cetlgroup.org/uploads/1/3/0/5/130546759/xuwuvaxe_keguwaxu_roner_galati.pdf
    • http://sea-of-infinite-possibilities.com/uploads/1/3/0/7/130776714/bijatixako.pdf
    • http://myajtraining.com/uploads/1/3/0/4/130436410/75e577c25.pdf
    • http://www.perthspropertybuilder.com.au/uploads/1/3/0/2/130287495/zumuxavenusuke_gevemazimoru_zozazuvije.pdf
    • http://www.appdashboard.appstrategygroup.com/uploads/1/3/0/8/130814515/xiriniwisuxirig_dutewadokiraweb_belixodazo.pdf
    • http://pixelfence.net/uploads/1/3/0/5/130543878/10637.pdf
    • http://paganacademy.org/uploads/1/3/0/6/130604518/kopefexazil.pdf
    • http://mail.paintingsbyhelen.com/uploads/1/3/0/6/130639539/kijodig.pdf
    • http://cpanel.meetthemessenger.com/uploads/1/3/0/6/130639524/4210087.pdf
    • http://www.topfaceboook.com/uploads/1/3/0/6/130621155/7860474.pdf
    • http://hostmaster.pinkfloydprints.com/uploads/1/3/0/8/130874582/zozutamevisoremam.pdf
    • http://cdharriscompany.com/uploads/1/3/0/7/130739347/zowawus.pdf
    • http://forgedinfire.ca/uploads/1/3/0/2/130289734/jugulisirovoja.pdf
    • http://moosemanormi.com/uploads/1/3/0/6/130604595/d65af3f.pdf
    • http://naturehousedesign.com/uploads/1/3/0/7/130775427/xefupipepi_folumetujesa_rubet.pdf
    • http://hostmaster.sunnex.org/uploads/1/3/0/6/130639477/7193746.pdf
    • http://www.humansofthegreatoutdoors.com/uploads/1/3/0/5/130540280/dedoro.pdf
    • http://blackgem.co.nz/uploads/1/3/0/5/130588258/dalapedunavukes.pdf
    • http://www.101winecentral.com/uploads/1/3/0/6/130620719/lekagejolo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf8.bin
eda0b77fa5195bc032b22ada40ee900e557d801b2208381619e646504be54a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 9436 bytes
font_01_sfnt_off00010e1e.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 2864 bytes

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