Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe9be75fc490e3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 08:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11fd310eaff6d70e3ed082ef4ae1276f SHA-1: 953c23d2d8f769f6004eff313edb349122d2ec0d SHA-256: d9fe9be75fc490e31a01ab45d8cf6fc03278778019fedb9e3b09e9afde5a33df
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with a high heuristic score for PDF SEO disposable link farm. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to obscure the ultimate destination or distribute malicious content. The presence of these links indicates an attempt to direct users to external, potentially harmful sites.

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://skonasystems.com/userfiles/file/dufukegaxidupod.pdf In PDF document text
    • http://majorpropertygroup.com/userfiles/files/81822433098.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/23504199120.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jilofedezukegidawub.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/roredavodezutad.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diposapulufake.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/12419327157.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/jinefekutipijomerabakusev.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/45030086618.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nifazarifufagepafikuwut.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/wukavuvopuxefururosefifa.pdfIn PDF document text
    • https://susta.vn/userfiles/file/wuzewubilagutapurudotejoj.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/99998018321.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/xasidulozudax.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/sasasesup.pdfIn PDF document text
    • https://phukienbep.net/media/files/86268574791.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/60887129633.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/58685232359.pdfIn PDF document text
    • http://air-con.ru/upload/files/sazikawetenudunelufazuwa.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bubigasixudoloriwijamos.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/9639537457.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d416b62544541510850e22f570378419/70669184992.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/zikedubezitan.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/5089069203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=beyblade+burst+mod+apk+2020PDF 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_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 17276 bytes
SHA-256: 4ac8ee8cf8b66796a94c4e0c767bea5f2a92ad7b61eba51eb72382774a443fe3
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 11096 bytes
SHA-256: 7c158a278a1880ca888928445ce0de5bce9f539e10ce3d8b28b80bc8eea7f011
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1