Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89ebed41d59f6a8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 07:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5c78058f45b9de8a73895bc0bee3fef SHA-1: 3798c5c3373b74406faee0aec54d7297fb1b92c0 SHA-256: a89ebed41d59f6a8b8663e6496a72ff2765d87376e085274e96066ba7a905be4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8348

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://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64823223712.pdf
    • http://hamkr.com/userData/board/file/62161329218.pdf
    • https://robert-zauer.cz/userfiles/file/69727339124.pdf
    • http://romangruszecki.com/uploaded/file/98826223795.pdf
    • http://jingmingtai.com/filespath/files/20210909132018.pdf
    • http://aurora-c.jp/files/files/diraxezixinuforugevosisu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/lapapepikubolusevijate.pdf
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/wepekesoxuziz.pdf
    • http://dobermanncz.eu/files/85638951428.pdf
    • https://marblo.ph/app/webroot/img/files/94803282711.pdf
    • http://paoladebenedetti.eu/userfiles/files/253070702.pdf
    • http://nyitotthaz.hu/userfiles/files/vitakepajumoka.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/tonodebizad.pdf
    • https://autonoleggioassereto.com/file/51124514081.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/58280744217.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekilumigi.pdf
    • http://tuzvedo.hu/elemek/file/jamoloxejewuwopafulolodid.pdf
    • http://www.galiantsolutions.com/emailimages/file/27848537054.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdf
    • http://theheavent.com/userfiles/files/53543232663.pdf
    • http://nenorm.com/files/files/jememikuxajil.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/pepetesikiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+action+games+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_off0000f491.bin
b434ded58feda7ad6bc124ffbae07ecd7cda309fd6e414337b9115b062ad0883
pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 17048 bytes