Malicious PDF — malware analysis report

Static analysis result for SHA-256 18539281cb7c9f7e…

MALICIOUS

PDF

53.0 KB Created: 2021-09-27 20:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc48fb4400072e5b64600fbfa046da82 SHA-1: bd62c4239c2ee762f86f944b872e313c4e470ce8 SHA-256: 18539281cb7c9f7e6e91b68c3cd5a1ee92b41c23c8c51d024a3969915fa66732
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host numerous potentially harmful files. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8410

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/funadaroxorodiweriweme.pdf
    • https://afayl.com/userfiles/file/80727178984.pdf
    • http://mtsskzy.com/userfiles/file/97169639168.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73878771110.pdf
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/girij.pdf
    • https://pastravariaizvoarelebratiei.ro/images/file/22761442424.pdf
    • http://chandigarhdatarecovery.com/files/file/11541242181.pdf
    • http://kidzcastleschool.com/singhania/downloads/file/56568590619.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/tesofuwokitipepenigefiru.pdf
    • https://floresdeserrezuela.com/aym_image/files/fovora.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1530b651---turefar.pdf
    • http://dgjst.com/upfile/file/89691201263.pdf
    • https://novamakine.com/upload/ckfinder/files/vonapi.pdf
    • http://gpe-el.pro/ckfinder/userfiles/files/rizodexatixan.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/nalix.pdf
    • http://taispacedesign.com/upload/files/jaxorad.pdf
    • http://chukysovin.com/img-svc/files/25844244705.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/muderasoroviwugaw.pdf
    • http://marathon-gexin.com/Uploadfiles/files/sinumopevatobotijotojul.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/rabawijotazoxigobekosako.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/92b4fea20896df6a8948ef4bf8e4ede6/43918509546.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/21671942787.pdf
    • http://mudrberanova.cz/userfiles/file/dumejedanadezudikofezi.pdf
    • http://digivideos.net/ckfinder/userfiles/files/bavejimavodog.pdf
    • http://mextro.de/upload/files/31042449042.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+text+file+in+mobile
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ca.bin
d3f4acf644bb1d701491b48c5586ade95716cfe7b1d92f45b2462c6d10f222e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 10520 bytes

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