Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff18d51a4c39c24b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 22:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df4d3f45b1ac835d1d308ced76ab77fd SHA-1: 8d4904138df3030c221f3e9a10f1769edba1b761 SHA-256: ff18d51a4c39c24b370bbe91aebe468fd2b61c5dccd3318c6251ddb88512b1ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613069857766a---17973394233.pdf In PDF document text
    • https://profesa.net/userFilesfile/29274833321.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/78451097872.pdfIn PDF document text
    • http://labsshop.com/d/files/nezilajiragomajemaramulo.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/logujobi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d700948f9095c8d1eedd82e12fb0f648/bafat.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/69260036588.pdfIn PDF document text
    • https://strechybenesov.cz/content/wozupejirumeligogebomijex.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/84286319964.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/demetone.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/galurimuneditidovifomevun.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/44736889385.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/fuvonomajuwuzibarulafoso.pdfIn PDF document text
    • http://allycatering.com/userfiles/47732930164.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/50937070483.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/nuluwidokiguruf.pdfIn PDF document text
    • https://ms2oke.com/contents/files/fakekiget.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wojemozebizabivaz.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/83326883353.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/12464747875.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/gigixeludavonu.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/worogikum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+enhance+volume+on+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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 18252 bytes
SHA-256: 4f969b2c953d89ecfea09d345e9bca08814b7a88445d595793a1b3ac8696107e
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10712 bytes
SHA-256: 51446057400542653628de066d101ff92f983d1ca025022bbd455c17c085a2de
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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