Malicious PDF — malware analysis report

Static analysis result for SHA-256 857447e4df38ae28…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 14:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbbe3be6e1b4508d257f9b8739ec6a49 SHA-1: dfa1751ad41b75356ee1b31c25c01ecfddaa6213 SHA-256: 857447e4df38ae2840c8ed1c2c2aafff7b6ebfa1718e6a5e74009144163ef7b1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is likely malicious and potentially a phishing or malware distribution vector. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

Heuristics 4

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=clash+of+titans+cast+2010 PDF link annotation
    • https://franchisefarm.franchiseharbor.com/files/files/pikogijuvubomoxizejuzut.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/mamabutowa.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/94900464266.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vunukel.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/rimejojafebig.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/dikepos.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/61814474752.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/xivefixinomemopapus.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/bixezidoligez.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18873381805.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/68325855424.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/notebojobadonefufosafu.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/suziforegoguzumasazog.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/rajugorefuk.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead234ffe7---towurapufax.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fumumovoribinopopezu.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/kejejomogulaluj.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/eb3eddabe18c927a7263d564f8dc5ff4/83586882161.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vopukadupufuvisegamirevug.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/besukexudexupi.pdfIn PDF document text
    • http://cuiquji.net/d/files/39372720390.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/73674239989.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/renerukovamaxasazilonuzu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10528 bytes
SHA-256: de08d41aa6be8f1bc28fd15f3ba2e1103589863262d5b6b1912c06df3566bf0b

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