Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d86fb14a643ce58…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 18:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f787d8c943743b9a1b6f653c17ca8c8 SHA-1: d3d87955a17bad653fc068e51caf795bd96d2514 SHA-256: 9d86fb14a643ce587ac723a9afbcdf7be1729740128bd82b13990360deb24b48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=pubg+mobile+apk+update+2021 PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5560cba67---dofirikad.pdfIn PDF document text
    • http://profstil.az/userfiles/file/devolopodonakukagiv.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/96959007784.pdfIn PDF document text
    • http://horvathortho.hu/tmp/99885613364.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/36981182817.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/lanesinafuzugobopa.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/fibamalulewazuteriwuwin.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/didatewewojunewater.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vopizibevudewotemi.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kunalasuturajojapu.pdfIn PDF document text
    • https://msvadba.ru/files/file/vizojo.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/17437363929.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42151898d---65863797837.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/33441205547.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wozivarir.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pojuxisutotowuvix.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/1954522975.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/vobepibumuwamojafib.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/vumubevatafivedu.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/97932561788.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/99479224068.pdfIn PDF document text
    • https://bachson.net/upload/file/4084825691.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/61f5eb1cb641251a98f462414ec36b59/judinifuvapowafutef.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 17984 bytes
SHA-256: a54f54a043014668e4e5034bab3a7b67ee05f4de59fb40ed1dbacbd2b90afa01
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10988 bytes
SHA-256: 527330e5176d49737501e08be878881331e6eca30d88c8d51a6f938c5c1cb2e2

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