Malicious PDF — malware analysis report

Static analysis result for SHA-256 05adde83154875f3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-11 15:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ea4d88263e7fe50908f1c969b07d6bb SHA-1: be8a6dacfeb5f59c4f365771ee0b75e1f588e2a1 SHA-256: 05adde83154875f3af00a06315774333a77003ad205b36c0b5e231f50d044f35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of multiple PDF-specific heuristics, including external URI and link farm indicators, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coevent.ru/upload/files/pezeteti.pdf In PDF document text
    • http://www.39koratmachinery.com/file_upload/files/nerepeforipunilagaxa.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/74615047450.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/nituvowat.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/45471731327.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/pidumufo.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vuvekejapu.pdfIn PDF document text
    • http://jar-ted.pl/file/taraberamabubofizomet.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210911075531_ltdz4a.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jso5qrlv7hm9485dnl1afo1fm7/podupekuropozalujumanak.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/gedisizal.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/44873127151.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/norekavowubiwuranafu.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/pufovajede.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161381eb6b5400---45026214635.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/68552714592.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gisifatofafumapidev.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/36164830267.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/69509157362.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/97337263527.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/1320394552.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/pisufeluxikixowejagave.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/taradi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=miui+12+how+to+change+notification+panelPDF 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_off0000c5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 10840 bytes
SHA-256: ba98cfd21513b01b4e7d4aed8ee556565dc56cf83d000608c11fc4b27e8901d9
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 17716 bytes
SHA-256: af58d2200a93a1f2ca25a7eb9659561aa7cf165f7d846c50de19d8f908420fca
font_02_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1