Malicious PDF — malware analysis report

Static analysis result for SHA-256 623ba63182513291…

MALICIOUS

PDF

33.3 KB Created: 2018-06-11 08:32:27 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: fca12d13c404050d6566eb86bc5a7f40 SHA-1: f52f4db650bbed5d42f62e3440b89347a3047dbd SHA-256: 623ba63182513291aae35bc6936f18ab8cf76b591625da5d12af77d411f8ada4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains heuristics indicating it is a fake download lure. The embedded URLs, such as http://uncpbisdegree.com/download3.php?q=septimo-rayo-el.pdf, are likely intended to lead the user to download a second-stage payload. The document body, though heavily obfuscated, contains references to these URLs and appears to be generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9395

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://uncpbisdegree.com/download3.php?q=septimo-rayo-el.pdf
    • http://uncpbisdegree.com/download4.php?q=septimo-rayo-el.pdf
    • http://www.metafisicachile.cl/7rayos_violeta.htm
    • http://www.tsering.cl/hermandad/metafisica/7rayos_violeta.htm
    • http://www.shurya.com/la-llama-violeta-2/
    • http://www.subrujeria.com/OCULTISMO/MANTRAMS.html
    • http://egiptologia.com/egipto-en-el-cine/
    • http://eruizf.com/martinismo/doc/el_libro_de_enoc.pdf
    • http://libroesoterico.com/biblioteca/HERMETISMO/El
    • http://www.elportaldelaindia.com/El_Portal_de_la_India_Antigua/Dioses_Vedicos.html
    • http://www.samaelgnosis.net/libro/html/glosario_teosofico/glosario_e.htm
    • http://www.santos-catolicos.com/demonios/
    • http://www.anarkasis.net/epitafio/epitafios.htm
    • http://www.los-poetas.com/b/blanco1.htm
    • http://www.circuloangelical.com/
    • http://www.centrocp.com/el-nombre-de-la-rosa/
    • http://riverside-resort.net/1/study-of-content-mastery-answers.pdf
    • http://riverside-resort.net/1/servis-manual-seat-leon.pdf
    • http://riverside-resort.net/1/starbucks-safety-manual.pdf
    • http://riverside-resort.net/1/the-name-of-this-book-is-secret.pdf
    • http://riverside-resort.net/1/the-chronicles-of-riddick-ghosts-furya-kindle-edition-sm-welles.pdf
    • http://riverside-resort.net/1/ss1-third-term-scheme-of-work-biology.pdf
    • http://riverside-resort.net/1/suzuki-jimny-lighting-diagram.pdf
    • http://riverside-resort.net/1/the-hunting-of-the-snark.pdf
    • http://riverside-resort.net/1/the-uncommon-doctor-biography-of-dr-d-krishna-murti-1st-edition.pdf
    • http://riverside-resort.net/1/sistemas-de-transportacion-turistica.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://es.wikipedia.org/wiki/Tertuliano
    • https://www.sport.es/es/directo/futbol-femenino/barcelona-femenino-rayo-vallecano-24677/narracion
    • http://es.naruto.wikia.com/wiki/Minato_Namikaze
    • http://www.wordreference.com/es/translation.asp?tranword=like
    • http://llamadordelosangeles.blogspot.com/2011/03/el-nombre-de-tu-angel-y-arcangel-segun.html
    • https://es.wikipedia.org/wiki/Naruto
    • http://www.elcomercio.com/deportes/futbol-liga-quito-guayaquilcity-casablanca.html
    • http://es.enciclopediadelmisterio.wikia.com/wiki/El_Arc%C3%A1ngel_Jofiel
    • http://www.elcomercio.com/opinion/leonroldos-opinion-columna-columnista.html
    • http://es.naruto.wikia.com/wiki/Naruto_Uzumaki
    • http://trianguloequidlatere.blogspot.com/2010/11/quien-era-el-judio-errante.html
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409
    • https://go.microsoft.com/fwlink/?linkid=868922
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409
    • http://go.microsoft.com/fwlink/?LinkID=617297
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ef.bin
58aa7743197d0189b3eb50e5c8916183f50856620627dd628243e2d527bf184b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48EF 9776 bytes
font_01_sfnt_off0000682c.bin
e6c63a8429833a69b84eccced968a2a2b168265b23644390a4727986ae19cf7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682C 6684 bytes

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