Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46374ef8e652f81…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 14:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa37500464f8f5e6aa83433e6f3e2f04 SHA-1: 6061beb1c2032f70d2694a0f61839195452f9bfe SHA-256: d46374ef8e652f8134434c8cccc6b33bb5701733dcc0b06d81ec3c381a145ebc
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on potentially disposable hosting, suggesting a tactic to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://morebricks.com/ckfinder/userfiles/files/serigaresidifu.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/25592998311.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/matiwesoxa.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/22842047618.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/foxekemoleg.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zuxezuzidapiwelidunu.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/noxes.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/43296899642.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8bb248ebedba01e6dae25087021b6535/73086107131.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/xaxeraxonegiwuzaj.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/zixijavuxosesomaw.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/28241430507.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/nuzufegezekamanugamere.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/48352354140.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/gewazivetunufesatefuxona.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/39382870361.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/64848158804.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zewap.pdfIn PDF document text
    • https://stopserv.ru/files/file/98547615016.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9364ba894---37011187255.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/papotajowadifi.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/3765204362.pdfIn PDF document text
    • https://kimcert.com/E/file/jedovudilemudopexipisuvi.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/60695989770.pdfIn PDF document text
    • http://schubert-hh.de/image/file/48424688005.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/vejigiwapulugabiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=zombs+io+oyunuPDF 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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 18080 bytes
SHA-256: 08656f3aff53c1e724b6dcc55d1d14ca6f880d1f7d0dd8cd3853a51517d4c4a7
font_02_sfnt_off00012e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E28 10048 bytes
SHA-256: 222920c330e18b77e434dea0d4738269fcfbbf513c36981e53c9a33405db93b6