Malicious PDF — malware analysis report

Static analysis result for SHA-256 81725878fa7d4181…

MALICIOUS

PDF

67.1 KB Created: 2021-09-12 12:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 323a0bc94c0075a6fb0c3fb5c443a6b4 SHA-1: f1556f20359da6899219723c08e32930e904dac0 SHA-256: 81725878fa7d41816aaf35a2bab00b3b97360667d03eb9d7479bf5a457d390a0
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, suggesting a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8341

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 https://incense888.com/uploads/files/202109051313266144.pdf
    • https://jensbrode.de/files/file/vademigikujipapo.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/jikidanu.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/xetefepobumamuvaxiv.pdf
    • http://motovelo-nmsk.ru/userfiles/file/venafunetarinaredenes.pdf
    • https://fedico.ca/upload/editor/file/xipukosegeselodifufeb.pdf
    • https://njshore.drinkpoint.com/uploads/files/95588177151.pdf
    • https://shopinhome.com/ci/userfiles/files/dizozi.pdf
    • https://discovery99.com/userfiles/file/gatase.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613515a529df7---9114570153.pdf
    • http://thunderstar.cn/userfiles/file/20210911012134591992021.pdf
    • https://kentacademymiango.com/userfiles/file/60952869723.pdf
    • https://kovrdom.ru/sites/all/sites/default/files/file/7103002607.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/mijipazu.pdf
    • http://www.klccpa.com/userfiles/file/
    • https://equalland.com/uploads/File/zimovabozuviwes.pdf
    • http://chingyi.tw/userfiles/files/61156757888.pdf
    • http://fatename.com/uploads/files/202109121517357118.pdf
    • http://prestopc.it/upload/file/pitoloroguxutevib.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/tirupafigewej.pdf
    • http://gammatradings.com/userfiles/file/polixododudaza.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/kakapewifejopozup.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd64f47a0e---76236716045.pdf
    • http://tid.vn/upload/files/viraluzafuwomipuranubaxe.pdf
    • http://bolshunoff.ru/images/wysiwyg/file/manikutokidezabex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+juegos+eroge+para+android
    • 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_off0000e128.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 16792 bytes