Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe7d603eb6ca322…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 06:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73c590e8159f0bafb04d0d89457aa157 SHA-1: b891c0a057fa68324b60f14ba86a2e533596fbaf SHA-256: efe7d603eb6ca322be1aad595c7d4efac639050723a670ea05c5cf064336dc83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://romento.com/uploaded_files/userfiles/files/kedabizufubive.pdf, are likely used to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://romento.com/uploaded_files/userfiles/files/kedabizufubive.pdf In PDF document text
    • http://siamsankyo.com/Uploads/file/vagosonisuzanovikire.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/kitumokitowudawowixupe.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/dimitowidofelaxurukef.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/40028812211.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021919420196015.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/33778434608.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613593997bef3---44353100527.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/kazagowij.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/86155117409.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa1886d43---70744204883.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/mokadujesedazaruk.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/toromimis.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/pumiluguziravuwufemov.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb53848e---larixutojuberaxolipupe.pdfIn PDF document text
    • https://isleo.com/i_photos/file/63984833868.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/lujutirugitumexobegovuraf.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/40641169321.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/dubar.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/39707847667.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/35786744804.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/raxogaferani.pdfIn PDF document text
    • https://mcsfood.com/images/file/43307509039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+box+home+assistantPDF 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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 17244 bytes
SHA-256: 47d2ae2d290cf8829e985b47dabb047e1429a12267a391a6a4d49337f282b278
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 10692 bytes
SHA-256: 302ca73da072868972b70f81900820f31d41800e21447e3c20385b31f3299bb9

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