Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e533e0875aa25d…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 19:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b52ad6d5e43667f9ab9a12b155d19bd SHA-1: fbd4f102b0eead0f9844eaa754f33dc4a9b2359d SHA-256: 67e533e0875aa25d135ce31ba89235cf845de8aa3e2d2f1ff86b3abcc702c937
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=earth+taken+3 PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/11287595248.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/21371888724.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kewufeguzagofafel.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/fukavexuvofegupemewukekuz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/78077221747.pdfIn PDF document text
    • http://clerus.hu/files/file/kukivulazutokilereve.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614de88c34bb8---lokirujakepuro.pdfIn PDF document text
    • http://nemalipics.com/desit.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/44967735600.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/24512696880.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/11330659886.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140024e999d5---zevazisevojilefetu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/gikovegol.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/rakisunokikaxegupev.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/21600713625.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/5031544698.pdfIn PDF document text
    • http://modero.vn/upload/files/32932025078.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98618341919.pdfIn PDF document text
    • http://ukrfirework.com/images/file/97719568883.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/41548230258.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/60489629598.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/12247689778.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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 16180 bytes
SHA-256: 16865fe5b2b327ca014ae087acc3450de38546abe3b10de4674e01513e0b7459
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 10024 bytes
SHA-256: 19662c3b608b4624343190b6da5cff3374208c4af114360ef04cb15474d04920
font_02_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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