Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51e0f19f4469f04…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 09:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6359db6b1039832ed0dea66976388eb7 SHA-1: cbb6cd52edffe308ac736ada762672722bca21dd SHA-256: e51e0f19f4469f043e09821c8cef370771b1b6e2246df20569cd09e5ce1bf648
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=flex+hd+movies+2021+apk PDF link annotation
    • http://www.cafeinca.com/img/public/contenido/file/dolasizuwinibigeju.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/pixopazekipu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/12644413341.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/narifapogi.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/62069921280.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/juzegadubuzirek.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tekozoxow.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/pakenilarorug.pdfIn PDF document text
    • https://isleo.com/i_photos/file/lubifavapawazukazumipa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3gj9fuja3r44jvrlo1jv5gvrr5/minonupakusutetaker.pdfIn PDF document text
    • http://progetec.org/userfiles/files/basoburosi.pdfIn PDF document text
    • http://www.77ice.com/upload/files/wujuliwugunewelidofarewe.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/58756733509.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/pesagomoruvulosuwunup.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/41451734387.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/90194490743.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/80013216388.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/dufukujurap.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeradasu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/lamusukezoraz.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/dumilikabiduvipumekobekoj.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/81515249999.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/bonid.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614210dd967a5---makodokimagojapud.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/20493961343.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/jasemivunilejoloze.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_off0000c008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC008 10884 bytes
SHA-256: 527b7982bb2364b37a3ea0178caddeb8c52b25ce05eba54b33e3f8bbc3011848
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 18424 bytes
SHA-256: ad03360223a676906b566c39dacc5c7abb2f2a496f9fc5150a82ef6c1c794360
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1