Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf38c33d62f8d3f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 03:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f053d560f801d4c77a12561f4024bc2 SHA-1: 2c3378e1675d4426dac0522ecebfa1c4432734e0 SHA-256: 4cf38c33d62f8d3f899165ce328688cfe9c5f37268a6dc222ae822ca8795d14a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://birutelorasin.com/contents/files/kulaporudutafirifaf.pdf In PDF document text
    • http://dichvutheapec.com/upload/FCK/file/newutexesimela.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/92369290626.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/juvanetuzos.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/49377892960.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/verozami.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/vamifope.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/vonapijejuvojew.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/99493120008.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/88731687243.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bajegafarodali.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/bufejamagamejifugu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb6ccc362---kipira.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wizosim.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/dudovipedevepovobas.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/pusadomefidurusalopuwu.pdfIn PDF document text
    • http://pi-consulting.ch/download/88497412189.pdfIn PDF document text
    • http://perksys.com/userfiles/file/58784801611.pdfIn PDF document text
    • http://pjteam.hu/uploads/nufonesinemexixola.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c7325bf0c16858b334bd45f7ba576358/sewanonopuzivisoraxomaven.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lumegukadita.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/31763567872.pdfIn PDF document text
    • http://nprofit.hk/userfiles/81438111216.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/54264974661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pathology+for+nurses+textbook+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_off0000c2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EC 17800 bytes
SHA-256: 5b93927f16981544dcbe407d24d6dd3a6d47426c446a24d5d325ec9b1040f0b6
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 11232 bytes
SHA-256: 8df0eaa3d1e757e7e68ed16a91a44d07dfe375e17249ef601b310eb29932f386
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.