Malicious PDF — malware analysis report

Static analysis result for SHA-256 effb6b084f218d89…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcb4a095f768fdf6d20b26238565ec33 SHA-1: 8f35c5bda1803a0cb45139076e2171c1c088a9af SHA-256: effb6b084f218d89860e406869b50a60b4241f4a4b6e5381c3195617b922f290
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7670

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://abofahed.com/userfiles/file/82938720145.pdf
    • http://bmcnx.com/userfiles/file/nugipalurawamefina.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/bavowekenodur.pdf
    • http://sugarfree-gelato.com/upload/file/65077761390.pdf
    • http://toanthinh.vn/webroot/img/files/zoboxigigobagoti.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/pedipinolorekadigope.pdf
    • http://bioaec.com/userfiles/files/nizuvivanamasidogitoves.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/21065227355.pdf
    • https://www.ijdsir.com/ckfinder/userfiles/files/xevifokeketego.pdf
    • https://abzesolar.com/uploads/files/14651616705.pdf
    • http://hexindechem.com/upload/files/18994381115.pdf
    • http://ikuma-car.com/js/upload/files/vukadafuk.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/sojeji.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/retumarofidatemufatikovaf.pdf
    • http://reichspfarrer.sk/file/zosotejukeza.pdf
    • http://damnoen.com/ckfinder/pho/files/ribonuforuxe.pdf
    • http://geometrarontani.it/userfiles/files/80456437061.pdf
    • http://juha.be/_files/file/32666977234.pdf
    • https://undergroundtakeout.com/userfiles/file/60857846470.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zaturenuxipimipetutowapeg.pdf
    • https://deltarealestate-eg.com/userfiles/file/samonutumitetugogofovasej.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/98298644554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=love+2020+malayalam+movie+watch+online
    • 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_off0000f67e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16792 bytes