Malicious PDF — malware analysis report

Static analysis result for SHA-256 254c1ca038b978ca…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 16:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6011094348c148f4a06488429eea8ab5 SHA-1: 26e1bdb08ccdfa82c4ad7dc41107d548c811241f SHA-256: 254c1ca038b978ca1ede705c9e44f8a26de0c3b39a2db37ecfc91a03b3eda049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=cool+math+games+60+second+santa+run PDF link annotation
    • http://a-xian-coat.com/uploads/files/202109112311254857.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/75690119298.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99949550686.pdfIn PDF document text
    • http://com123.vn/uploads/file/93390990046.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jobesalogekizo.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/wapuzidibefajejedeziguf.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/zexugopupadawosofuw.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/86040374904.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/fupabufemilovurijetixuwa.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/vebepajiwegamosezag.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33089922143.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/wiselano.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109060220263222.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/86141687147.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/xalejojir.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/wanoteroruremejifepuxunev.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sopuju.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/zujug.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/mopazewiv.pdfIn PDF document text
    • https://angem.fr/userfiles/file/xugivebojonaperarovi.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/73193813866.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jgoseoas1aa8k0lp4apbmead00/jazonewop.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/38499705425.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/mimedukesufupuxufawired.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_off0000be47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 11144 bytes
SHA-256: b11495d4eeabb115de10d935fe012976d5df6b4a2c4621dace190e8edc9e2d83
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 15732 bytes
SHA-256: 0f3b39a03f0d3270d6cefe365b68e38d1aa5b5ee0e12aaf282024cfff035071d