Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3104675d437fd52…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 23:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eab67dce6749a4e948f74b2c91d5a16b SHA-1: a3166f793057bb1db39fc8c0f9fba843ffa1a788 SHA-256: e3104675d437fd522bb33b4604814a10321f440248fb7b89195a9013cfa5ebf7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicating it's part of a link farm. The embedded JavaScript and numerous external URIs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The primary attack vector appears to be a malicious attachment, with JavaScript being used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://cructi.ru/uplcv?utm_term=watch+the+room+2019+online PDF link annotation
    • http://aromacosmetics.bg/assets/userfiles/file/66425476414.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nujud.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/wirezegegemo.pdfIn PDF document text
    • http://kmsenior.org/file/files/rekovate.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/66841839624.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130fe1d0eb95---27423480206.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/walesajatomanovojito.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/miwajuvizafirir.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/lipuxujemisanoposo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/67868386624.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kikivitinojafidozaboful.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/14620151996.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/53073125517.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/39575385480.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/joladowe.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/64766159683.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/29778040450.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/74429820975.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/64779323680.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/60899554611.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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 10784 bytes
SHA-256: 6d5fcf5cc0c753833360684fffe2b4fe7931add2e313e6971625c64a6dd0e225

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