Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae88d4073617c323…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 14:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30f75c1c9e84fe0a6330b509d5b1f169 SHA-1: d90bd723f0b40d8962d10d1ea524ee9807140c0e SHA-256: ae88d4073617c32384aa53b860c961ef53c99a5bed58344ba7eab4e107fd2c63
134 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, with high confidence. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=the+strangest+secret+in+the+world+pdf PDF link annotation
    • http://niezapominajkowo.eu/userfiles/file/vusizatesuz.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/natesibeviriru.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jivit.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/95052715965.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/49401011125.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/fonumogotozikiwixomavegej.pdfIn PDF document text
    • http://bjjiffy.com/upload/20432403274.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109011254526150.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/29958091716.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pikakopozu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/87833903909.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/87070507491.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/ketunavexedazitadave.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161390622db339---pewunegixulowejipobi.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/42161295211.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/48587428356.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/ruforafozawawadi.pdfIn PDF document text
    • http://stattus.com/assets/file/kafotono.pdfIn PDF document text
    • https://ijpdua.com/contents/files/36513664453.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/41849557147.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n6cl1kotousdh42u59gntak8i5/junetofuvajimalufedipak.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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 17824 bytes
SHA-256: 9a4309271c7dd13ecd6824f15a1d430ccb72e4ddfc0515fc00538278269cdf0d
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 10948 bytes
SHA-256: caa80043b2fb44f684bef3c62ee8b6e5c4096dab041a979b75b2df7e19dbd061
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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