Malicious PDF — malware analysis report

Static analysis result for SHA-256 7409a0cf188c7487…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 12:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c1f70e735c52b25a8516b186f241162 SHA-1: ad85623c0861021682eedc53c1a19b4f06986115 SHA-256: 7409a0cf188c748757a25b9715ed46966c7692f523cc45fe5ff82b72ea95f8f1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to disposable domains, suggesting an attempt to obscure the final destination. The primary purpose appears to be directing users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ccshecea.org/upload/files/55527595767.pdf In PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25255397826.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/tanaseviniwon.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/34406391812.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/90349954361.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/xumipomerimekuxibowu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0c272f97---manadejunilaxuwel.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/32284847267.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/danovimixir.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/65151484789.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/mepekupositukajogagofuse.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/32007425102.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/wudubujodelelopaxujoji.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/66742797180.pdfIn PDF document text
    • https://mahae.hu/files/files/dokotowuni.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/72586449767.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210914082935.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/tokir.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907090906.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/7559420372.pdfIn PDF document text
    • http://rilta.net/userfiles/files/88132237393.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/xoxidatasojene.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/jififusupax.pdfIn PDF document text
    • http://strandedtattoo.com/file/laxabarodoxasuluzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=define+curriculum+pdfPDF 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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 16432 bytes
SHA-256: 737c14f20b72a635d311751f93da83a4ef1578c2a8ad4f8768a5e4a2801766e5
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10336 bytes
SHA-256: 0038d71c04578c0c0803fee81746619fdfc7f61daa498335e9dc6faea26a25ea

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