Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb0db28ce25e563…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 22:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e51394276d7ddf97a00140db5da90c81 SHA-1: 567fee10bd6edfd9d530bfb043763617a62f2862 SHA-256: 4eb0db28ce25e563baa8f4e79ea86de0fafdb39496ff3361a4d043f77a339913
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this assessment.

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 https://krisoc.ru/uplcv?utm_term=telecharger+sims+3+pour+android PDF link annotation
    • https://bustotoronto.com/userfiles/file/66465495577.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zurupa.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/getejom.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/betaxafifisigajisiduwij.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/lawelaroduwugup.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/gejosavuxutebajotiluna.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/texunub.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/tefiw.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/tefetavirogiwejuk.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xewakiba.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/debotadapuvijuro.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109121626242419.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/12764938288.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xogomarasatuvijeriso.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pudubo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/lefuditit.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/54507697067.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/sixogilojizizaxuxo.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/9442987465.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/36298443486.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/90358835982.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/49249883843.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/winam.pdfIn PDF document text
    • https://synersys.fr/contenu/file/17691301180.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbf910164---44932529185.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 21456 bytes
SHA-256: 7f173bb13a9d12a5758bcfc91b82ce8f2c05c7ab59849f3fb55926c53076e150
font_02_sfnt_off0001385f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385F 11096 bytes
SHA-256: a5b31b76ecd92f026fe697bb994e86d49544a42ddb2b504bf987ef02354fa6aa

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