Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef4b6b09442235b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 18:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 690a9030a0a2cdce03d832fcb5f36271 SHA-1: 81a649ca1d739d5bc25d99312f4f4ce0fae6781d SHA-256: 8ef4b6b09442235b562d8b6b67cdf89547549e7ceb5be13e44e86bfabef35e7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to potentially disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dlshixiang.com.cn/ckfinder/userfiles/files/pupozutimurifa.pdf In PDF document text
    • http://luberoff.com/userfiles/file/fufuliku.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43430131710.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21198468998.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fativubusemotisulizowev.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/velupopaziti.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/16336247011.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koluvefovoz.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/25636392787.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/ribebesebaga.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zarefefujifetebalo.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/66633960443.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/37997724635.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/bazuxog.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/81863268683.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420211b152e---17752643631.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db6202cc78---34393949663.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/64762635179.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xobemulezimovobaxeg.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/zusuxagekosomefisav.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/57347997986.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/23118513651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+essay+writing+websitesPDF link annotation
    • 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_off0000b115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 10684 bytes
SHA-256: 88c12b09910e881c2052da3ac6dfa2764961327b1fd5e7f3e3aa5cd9d2bd7267
font_02_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 15916 bytes
SHA-256: 4e9de50b0ec04c8ebf90ecb6dc3e53bd55363a3cbe83c8f6ebea1e9b579ed3bb

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