Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e1d6acd4a68277…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 00:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9a924901460c7dee12cbf67ddb700809 SHA-1: 3da440c4dc85406b228d1e8c32a7cf57362576af SHA-256: 28e1d6acd4a68277a6333f7460a2762e51cfa1acd5444e473441c16e0f05330f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure strongly indicate this PDF is designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=cute+aesthetic+symbols+copy+and+paste PDF link annotation
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zijoke.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/93118708570.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/fuvutavusonafib.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/54d88bmj8p89pmvs322jn26ihr/46136800423.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/gekixejuvifatugiw.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wenesuwiduxatumisatevolet.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/91527716600.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/nolitodumatikid.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/2500635168.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/birafezepewilide.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/nifusirapibavemojakig.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/66799471788.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/40208245564.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/47930703414.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdfIn PDF document text
    • http://envigest.cz/upload/file/42458422437.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/96866219613.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/paxiwav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438e50a848e---28369665018.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/85427216093.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/9696669429.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/67486111922.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/povelaxemaga.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/20659178067.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/buxojafod.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/ronovoso.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_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 20556 bytes
SHA-256: a0b8bb96f8d9b3beea7af6f15319771baef275de161c0d57c812d9d5c55507f5
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 11064 bytes
SHA-256: 815ac001ad109351ef7a2e4faaf512f2a46e6accda472c910146192b785e6c68