Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e933d4dff2c4a1f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 02:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ef0d997979ddf86899014f9ecb7947c SHA-1: 316b073a19fe6712ec86e700e827390b901ed755 SHA-256: 0e933d4dff2c4a1f220fc14afa9f1240d443498961fff8081db25936470ebaa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=change+hostname+android PDF link annotation
    • https://rm-parketi.si/uploads/papoxomejiruta.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/lifekuxu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/tewametuzosuwiteke.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/42599859667.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/91606908439.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/sodudezimabibomuwa.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/gugefatimivalulekis.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc78e7c9d---50659717812.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/batubonebizusopozujek.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wimobojor.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/19568572789.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/78954082457.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/83550961454.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/5762821848.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/susugus.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/89564641563.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51369830041.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/37478198886.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/gavukuzu.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/12713384948.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/gagulorabi.pdfIn PDF document text
    • http://robbes.nl/media/files/9052190028.pdfIn PDF document text
    • http://rs-entp.com/upload/file/84982020325.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/polilavitukuwivix.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/1284486600.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/fubedorumogunugagu.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/35638483440.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d3c1a5034fef968cc2c1d9e96f5dada6/wadeketewepejimajetuxeku.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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 18232 bytes
SHA-256: abdb0a92a5c25ae45ab052801fc2e371a5e67f3d362847fdd41d6d022f45224e
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10680 bytes
SHA-256: 213823f903286e3be6c308457b28b07377eb5bfd058d7a9eab55b4bd209b2496