Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23646190c06a153…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 02:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca26e94ed05c85f8def9c8705e95d2ee SHA-1: 0d0d4e56f34d43e465d05e15f27814c10cd96bcf SHA-256: a23646190c06a1532cb2b9e5b8388afa60cf77229e969effd845ce310aa7ac4f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users to harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4701

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://oniceh.ru/uplcv?utm_term=square+root+till+25 PDF link annotation
    • http://thrifty-uy.com/files/others/95709766794.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/22543856859.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/92949886096.pdfIn PDF document text
    • https://funbugs.ie/files/file/72433089711.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/23911735493.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/pevuzimeware.pdfIn PDF document text
    • http://hbaoge.com/upload/files/29517004957.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56f2ac590---1510238444.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/xewibuzaribawisuwu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/balotorewukazi.pdfIn PDF document text
    • https://mattress-leader.com/media/22227605217.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/2425800700.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/56808072760.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/evqu2bha3bepfhv2kqn95dqji5/jizusujiwakilorilujulifeb.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/wetatulojufekoduzesaf.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/4323870743.pdfIn PDF document text
    • http://vitrine-prof.com/files/59569909172.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/gavuvokezeratow.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/52681699073.pdfIn PDF document text
    • http://sswjeans.com/files/93379996636.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/89764334830.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/10890039237.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/19353773774.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CA 10404 bytes
SHA-256: f6b945497de7f425d3d46f956c42832705462493ff0c8e1c47f263fb29f4895f

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