Malicious PDF — malware analysis report

Static analysis result for SHA-256 505b061c3c0d17ea…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71dd7583c04e67084cc36db396b453a0 SHA-1: 087bf00dced20dcafb88be763c66b74ba92a061c SHA-256: 505b061c3c0d17eaf756ed20daa4441d67ad9167e78bf08b042c8d73a7b0176a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=descargar+apk+de+metal+slug+3+para+android PDF link annotation
    • http://goforthegreengolfpools.com/userfiles/file/12496213023.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/50116322078.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/dipatu.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/4676539303.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/numezulufuredov.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/dilulowakeraxojozuvofugan.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/kuzijewisupezawade.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/16023648353.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/nijexemekizurirulojurera.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/sefali.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/28218147328.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d069ab2c5---vixodoj.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/23238441785.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/76455460830.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/62874150771.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/36351386198.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/49328883353.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/viwufikaba.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/tusalepoworo.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/sikanigakaminex.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/vamoxukute.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_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 18776 bytes
SHA-256: 806f6be63a7f9d08d465bed5ca21880cc4b438763c516ccfff33e280d3b81f93
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 11224 bytes
SHA-256: e65a05ff3b6357fc63ad6e549cebfa8c7b8f57150b64282ebe38753a7a2a7cd0
font_02_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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