Malicious PDF — malware analysis report

Static analysis result for SHA-256 033fadf7cd62bd18…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 07:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2246d2a6d8ff8fd0cddfbb7b47d99497 SHA-1: 8a2a45c948ac81daf58172998e426b850abcc107 SHA-256: 033fadf7cd62bd187254b28c3639a76f482152e231384acc0ed24cf4e5cab72a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=locker+codes+nba+2k20+vc PDF link annotation
    • https://www.nevjegykiraly.hu/userfiles/files/39530405471.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/59697599704.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/94742211943.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/29363639935.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161343b8a163c3---vupunukuruk.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/50556091769.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/51587595637.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/voxil.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/fepawu.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/ninizoxudusipoweziri.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133de067e281---37653207682.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/21627694358.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/texemikatukejafuro.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xomanibatumatuzajivexigax.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vilirevukiluxosapinaluki.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/wadegesujipugu.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/67859632776.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/56022986709.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/58463309715.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6611951247.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631013341.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16224601918.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 10624 bytes
SHA-256: 2c322bf13c4634c2803343e92df90a1dd0a3a1dd36bd0b79e04c34c605054fd7
font_02_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 17492 bytes
SHA-256: 0f51680d442da03779b8a954f5b27efe24e03992785f2d79788a2d92c5ab2c5a

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