Malicious PDF — malware analysis report

Static analysis result for SHA-256 999bf0f50335b4c3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 10:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a37705a7ce129e46167d80b98bd1891 SHA-1: ae1b12f52f3a113998e6fa5f225c3dce0e134a47 SHA-256: 999bf0f50335b4c3b21ac311e37c14b8092142421f743eeeba4c6ee1170118ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown domains and structured as link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent, likely for phishing or directing users to further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://network-italia.com/file/13053452275.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354f0449b7c---rerope.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/dolifosigipinuk.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c966ffca37bd5976c0f3ed81ac1ba8b5/runuvutimizuzomise.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bonosemed.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/34677971904.pdfIn PDF document text
    • https://olterus.org/contents/files/bodutonimikar.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mafusekeb.pdfIn PDF document text
    • http://levotst.com/uploads/files/12965709803.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210919105437.pdfIn PDF document text
    • http://hevolta.com/upload/file/wijowukomajawef.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/34277910666.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/nuximizixapuresonerowi.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/rajivurog.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jevib.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/wavivu.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/43231783361.pdfIn PDF document text
    • http://shopabrang.com/images/files/tevigaxugawuxitigokamiwig.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/37782550239.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/86354645316.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/141009333.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/3648061701.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/99945940827.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/rifamimuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=which+is+the+world%27s+largest+countryPDF 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_off0000b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 10976 bytes
SHA-256: 6b99dcc1275c791623520a5b466bfd42bea9aa0fd833f5a2955af57229720660
font_01_sfnt_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 14816 bytes
SHA-256: b525d5a977edc914eabb8c422c283fba087b1a81331ffa0fa4daeb644b13fdec
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1