Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab517b2bb79b2ff4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 12:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7824947406f453f89ce340fec364ac6 SHA-1: b60c0daff5525908a205da0a171d3b9c3dde5b94 SHA-256: ab517b2bb79b2ff447fd231245c8e4678243680600bfab7935f957174cf88b86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting an attempt to obscure the true malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://grafconsulting.pl/Upload/file/39482660855.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615039bda1d07---86137561888.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/91422886037.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/92354953581.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/71632850163.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/15634146831.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ziteted.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/39107024561.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gugulomuzifixunesul.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/98082336329.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/totetujumanozifedozo.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/55663684541.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/17565868769.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/35412663948.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140d623b4bda---rotosomunonazi.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nalewakodati.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/panitedokupa.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96084117789.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/sozenogibunebivofelo.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210922_161836.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210910001433.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/jurodabesedebunodupezebip.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210919040038.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/93629580789.pdfIn PDF document text
    • http://melabo.com/upload/files/rutetuvumoxujosufelixagoz.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/labutixafafinebupufik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=make+it+happen+full+movie+downloadPDF 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_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 10832 bytes
SHA-256: 2035aaa81d28d31d7764c4001d38ac759a7b56520384d5acc63b95f7060baf0f
font_01_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 16144 bytes
SHA-256: 988b18ad55deb864e74d9920199d4196480992f1f6b511351262df2381917a96
font_02_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1