Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd16975e4117203…

MALICIOUS

PDF

36.7 KB Created: 2020-03-21 15:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7420ee1f015ec1f6860ac83b8b6535db SHA-1: 8faa6ba35290b467b7d9b0ec87fe595251e90ebc SHA-256: 6fd16975e41172031694f768179da04d87d60f7235d49d532d1d7879ad2b9c05
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of external links to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs. The primary goal appears to be directing users to these external resources, potentially for malicious redirection or to inflate search engine rankings.

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://khpottery.com/uploads/1/3/0/7/130775762/130775762.html#preparatoria+oficial+anexa+ala+normal+n%C3%BAmero+1+de+nezahualc%C3%B3yotl
    • http://tndconsulting.com/uploads/1/3/0/6/130620637/3620723.pdf
    • http://seogooglerankingverbessern.de/uploads/1/3/0/5/130550778/6159906.pdf
    • http://aesadministration.com/uploads/1/3/0/6/130603763/dejarinudej.pdf
    • http://giffenconstructionservices.com/uploads/1/3/0/5/130588377/rolugewij_riguko.pdf
    • http://kariespin.com/uploads/1/3/0/6/130604894/4356155.pdf
    • http://annabelmayphotoart.com/uploads/1/3/0/6/130620232/komaxelibosukoju.pdf
    • http://santafedatahub.com/uploads/1/3/0/6/130604270/wosaworifeweg.pdf
    • http://mta-sts.mail.idahohorsecouncil.com/uploads/1/3/0/7/130776220/wevoxaxuxenu.pdf
    • http://www.womenoftheword.info/uploads/1/3/0/7/130739579/8ace6a8bc8f29.pdf
    • http://shreddedveil.com/uploads/1/3/0/2/130287871/76190d76b5c4fba.pdf
    • http://www.twoeuropiancraftsmen.com/uploads/1/3/0/8/130874126/2452002.pdf
    • http://lakeviewtheseries.net/uploads/1/3/0/2/130291552/pefivaxol.pdf
    • http://defineconference.org/uploads/1/3/0/9/130969939/galaf.pdf
    • http://hostmaster.tomwray.co.uk/uploads/1/3/0/6/130604394/bovup-woriwusotadebub-sixizaboda.pdf
    • http://franco12.com/uploads/1/3/0/6/130620923/jinekaseta-lesimef-gamebofogake-sunodivax.pdf
    • http://ricabarrica.com/uploads/1/3/0/6/130621243/198f9b7ce.pdf
    • http://toogoodapparel.com/uploads/1/3/0/5/130551445/6663096.pdf
    • http://jonimondi.com/uploads/1/3/0/3/130323131/pewubuwitazijeburi.pdf
    • http://mobe-eze.com/uploads/1/3/0/6/130620587/8312786.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_off0000621b.bin
2333f2c6991801603068ff902768253621bb06d83cdf56f623421347b8fa1a72
pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 8904 bytes