Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1a8063b9cf5b45…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 06:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff073f04cf88b5b9dbf5e951f0378d72 SHA-1: 656a2dc48ab94287622ea135c018d587fedcd55d SHA-256: 8b1a8063b9cf5b4517b1e8a3b202a3936419707066a96895519d558b61e4237c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and numerous external URLs are present, suggesting a redirection or phishing scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pistant.ru/uplcv?utm_term=fancy+text+copy+and+paste+generator PDF link annotation
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/60820211307.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/bibifeseliwofolubejok.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/dikenuv.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/pulanarinowegasusor.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/59486509913.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b74441b6---jejitafosevi.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/75076429796.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/busenewurejupumopasezu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2111865796.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/lalokukizoxejisifada.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/wixufifizedowulumazu.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/82682581310.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xubagaledamibobazixukasum.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/36740284287.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/dizefelomesilumuzasafigim.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dekulisafutirib.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/95898290520.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/xikasefub.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/donalotawuv.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/29044640667.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/98920075908.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334a33b78cb---49482462391.pdfIn PDF document text
    • http://videlec.be/ressource/file/89127986595.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/fezunan.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 10744 bytes
SHA-256: 50bf517b07dde397a0a39a4cce746667a3d91f31409cac872c21de57cc4033d7
font_01_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 17844 bytes
SHA-256: 91742796fd60fcbbbc5d46c412405fab3ca710019076b0950fd5ba43311e975c
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1