Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d874a18b7d2021c…

MALICIOUS

PDF

58.6 KB Created: 2021-09-11 09:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6d9b120da12eeb7775ea34a8f34eae22 SHA-1: f720e77e786726fc3aa0276e2537ca0f85e5bf4c SHA-256: 6d874a18b7d2021c371334405de7d112cb2ddf85fa81f15d42a82b4418ad6da5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4569

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://masukpt1.com/contents/files/24712964307.pdf In PDF document text
    • https://quatcongnghieput.com/uploads/files/85972372327.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/68109901112.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatulifuvata.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///dunowusajamim.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/vutotaligevemune.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/pegerixodajijudopi.pdfIn PDF document text
    • http://sial.pl/galeria/file/koxunogizufafiravate.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/zunozotikul.pdfIn PDF document text
    • http://hanshintech.net/data/file/pakujegix.pdfIn PDF document text
    • https://x-software.cz/data/file/vumowuwado.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/7566446714.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wabowupel.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/34380789742.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/13675209716.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/bofupudelosebojun.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/17122826761.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/74879371903.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210902145208_1370754367.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613beee3f3feb---dedurukinameb.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/fesagi.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/dutabez.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/5475191367.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/62114437412.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d85fd40dd---78272513361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=proving+trig+identities+calculator+with+stepsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 11048 bytes
SHA-256: 391e7667b12949344933737a4aa50ecf9552e58af78fb9b57cc3f85402bbda65
font_01_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1