Malicious PDF — malware analysis report

Static analysis result for SHA-256 53208e81aca4eb13…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 13:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbf90d256c08b0c529504994833dc6c2 SHA-1: 6425d512d64906d6a7409ac406e21c221d1a6298 SHA-256: 53208e81aca4eb13c03f68d5fb58c9acd3c6b594b29013ac881ad56f38c53bee
134 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 are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=can+i+control+apple+tv+with+android+phone PDF link annotation
    • http://ztkammer.at/uploads/file/fuxituxajenatifegaxig.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/givepa.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908124442.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/bavad.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210910055807.pdfIn PDF document text
    • http://tzsunup.com/upload/momokulawukokokotub.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/leposafifaxukexesewe.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b177d11a---94836226459.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/66680816557.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/wulajubufoxetufirojimokap.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sapepirese.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/pefefazotamumikawujek.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/dejirezanofujaxes.pdfIn PDF document text
    • http://chenruichem.com/upload/files/bupijexuputefi.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/46245136423.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/gelezorixuwab.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/49010903435.pdfIn PDF document text
    • http://fnathservices.com/upload/file/vunoxerowidiraguwi.pdfIn PDF document text
    • https://krusomying.com/data/file/57898906081.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/82040494682.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8724138291.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vazaxepavobe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343efd80180---93258322550.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/golipavuko.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zewitatuziluzirenoxos.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_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10624 bytes
SHA-256: 12729602854dd0c4a2a521c629e7b89e4db654053f8d05ad31df47adce5fea0a
font_02_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 17184 bytes
SHA-256: 4367dcce85afa97bd95b645b5a9bfaf4a9a07d99b59fcb20429d93b505c4cfba