Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c7a84713e866df…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 22:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 401de11f7655a87befd77a08c1365671 SHA-1: 4cf1947dcfee934e25a3f707ee7d3dcd033f7886 SHA-256: 24c7a84713e866dfa0e774e461054a856944558498d74eaece92d59ce3eec28d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=best+app+for+scanning+qr+codes+iphone PDF link annotation
    • https://avistravel.ro/userfiles/file/xabup.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/dedikorafojab.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wuvixuluzifasajez.pdfIn PDF document text
    • http://ridendo.cz/files/file/80059242582.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jilokejitarasedagezivepi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/71825301503.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/goxogasesuvibujobog.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/mudizatijifer.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/70852051366.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/pawenafusofagedikoguvu.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/kofixajofof.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/65167625291.pdfIn PDF document text
    • http://topp.pl/_topp/file/lowijegusaxonosekoze.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/31162187330.pdfIn PDF document text
    • https://sambelteri.com/contents/files/walaxefozasewir.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/46014568540.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/xiragamutili.pdfIn PDF document text
    • https://huanghecables.com/d/files/miduki.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/xojewamoto.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/4725309172.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/55723766238.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137adfcaedb4---juruzojotejajakezuxefub.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/narano.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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 17420 bytes
SHA-256: b5db619f38d56cc7e24f4d2c40bb4ab89c5525b9d49d8d32d0d4dfd701bad4b7
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 11052 bytes
SHA-256: 3b6449037618509f42532eecfedb82d30474b727bc9faa5a6d420bd1a0fb97c7

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