Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfcb8f819bbd7f9…

MALICIOUS

PDF

85.8 KB Created: 2021-10-09 18:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a34d9288f8ab7beb2103acfdad5f4f8 SHA-1: 6bc42aef31957702d9ee162a790fda39776ae43f SHA-256: 3dfcb8f819bbd7f9e5d761dd4267f0a4201e1474f5564481510e5cd75dcf99bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, and the presence of embedded URLs further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://garglob.ru/uplcv?utm_term=government+service+manual PDF link annotation
    • http://busankid.com/webfiles/board/file///65643818747.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/wifemubopunizoradifatud.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/66360671732.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/07554fbe46e378c21152fedb5a932a5a/toviwi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/mumatuvuwamapugap.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/30882032574.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/vupowik.pdfIn PDF document text
    • https://pecintajp.com/contents/files/muwejolibonaw.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/podizora.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/72314248451.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/pegikebufegekopukiga.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210916015654669388946.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/64905620244.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/xerimutaboxud.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/16cf77a1333e8968b88ca6071b11c200/91448846427.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/15005528539.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/97227554955.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xorusajitazugeworuwe.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0838143001631700613.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/90667132544.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/77679009452.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/wuniwupavepogawogi.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109080930268545.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/9066980889.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/72960485971.pdfIn PDF document text
    • http://dasbluemchen.com/64301682699.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 18400 bytes
SHA-256: 849a0fc227291d70bac94c97baf0ed0ce9191f6d0782cd336e7346b9eee0b2d1
font_01_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 10596 bytes
SHA-256: 50fe85d5bc1c9d902b30545e09b191f055e320319bdb7a718581cb6328477d55
font_02_sfnt_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1