Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b5489bffbb940f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 18:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c60d3652e763a2de26ec9289a4aab135 SHA-1: 6e2c3268390064263e20ed865419326de6fdfcbb SHA-256: c6b5489bffbb940f5b53b4a81d09a41ca4c813e4fdbd6184319b4fc40058aeb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains. This behavior is consistent with phishing or malware distribution schemes, where users are lured to click on links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136687c149b5---fitojejunebawarol.pdf In PDF document text
    • http://aptwash.com/userData/ebizro_board/file/xofofuluzopewagurawedazo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/39753718405.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/89689207867.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/73911937692.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jowomalapon.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tedepo.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/46296176466.pdfIn PDF document text
    • https://qkon.ca/images/file/51857228120.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/44371196335.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/fozerupuxol.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/muguzi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/94ab758489612fde313189e86de3012b/togojabowed.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/36230253251.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/54741158430.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/45379376932.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/12802787564.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/41169381873.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/84168244686.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/55808134367.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rovegad.pdfIn PDF document text
    • https://phukienbep.net/media/files/86356766054.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/sobuzulabajokovono.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/88396982460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=prison+break+season+1+gomoviesPDF link annotation
    • 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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 17856 bytes
SHA-256: cbd6fc232b050044bb87b80bd26691cb4b867dbe2b55d4f9e32db4102e415656
font_01_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 10660 bytes
SHA-256: 88f5ed6a489c2d355b0a9aed90a88b1dca1ba5dc906480c1a9d80fb009b7f088
font_02_sfnt_off000134a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1