Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd33a59cc766888b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 00:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4df3fbad48e50ac9c1a0af69810fa14e SHA-1: eafaf27ff692273542309073281ba1f56066df02 SHA-256: bd33a59cc766888b2a9ddedd6a9a83993ca5137846b3f106260f31c46ed22574
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The document's structure and heuristics suggest it impersonates a cloud document service to lure users to a potentially malicious URL, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://h016s5or78-du3.com/contents/files/82179061977.pdf In PDF document text
    • http://fotostudiovaccari.it/userfiles/files/80711795105.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/55101716518.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/94292965339.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///61366042902.pdfIn PDF document text
    • http://pileki.com/imgup/file/vomobuvewutabijotimi.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/kuxopoxitevemodizabejemav.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/nugobe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kipinalobimoxojuzajuma.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/224981876.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613649ab4c587---31387878462.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/tufovenajojuduvelew.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/27610602920.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/levazi.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/mezivuzobikosupip.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/kekifo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/57031308076.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/39767880505.pdfIn PDF document text
    • https://deepex.hu/hirek/files/34195815449.pdfIn PDF document text
    • https://basisangka.com/contents/files/92555581186.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/xalogovugumagokigoliv.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/8788893492.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/tipuxenexasalokapibazem.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109160151207264443sxmcf.pdfIn PDF document text
    • https://iword.de/userfiles/file/61971935086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+transfer+photo+iphone+to+androidPDF 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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 18056 bytes
SHA-256: eeee154fe82a341f6d6741c155de35dd923cb8cab1b2707adfa721f8ee99b5e6
font_02_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 10628 bytes
SHA-256: 911ebf0d86bf67153339407ac56f61633dca6fbeae5ff1cb2373a09d595aac13