Malicious PDF — malware analysis report

Static analysis result for SHA-256 7733edac7e1b74fa…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 16:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdb97dbd19cb52c00472cf9799aa33e3 SHA-1: 7f55d17026a3dd48bfa3c33dc7b71f0122e07c80 SHA-256: 7733edac7e1b74faf235c8c35ecc92010148209c654be72471c458e48f9b9073
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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=cinema+tv+app+download PDF link annotation
    • http://thsport.dk/ckfinder/userfiles/files/46464705345.pdfIn PDF document text
    • https://ms02bet.net/contents/files/33883289497.pdfIn PDF document text
    • http://www.polni.si/Images/files/wavodutagodasirekadeze.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/37040539568.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/mofezexivegofusi.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/mixalen.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/puselipiwawopazebi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/noperufetuvebovuwabof.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/92830201708.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/81454368826.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/xedatuporosivexomogoj.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/dafoxi.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zetamilubiminetipedoxuvok.pdfIn PDF document text
    • http://vaithun.net/upload/files/ponorevewifuz.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/81035933458.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/80b9164df9b7bcf93e7aa67e99df5f8b/nemajusiveruzuzagevofar.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/sipepida.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/nuwibipototobuwanaduzuji.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/kudogekuvupinu.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/55564585676.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/fisibefejorenizefafabisi.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zofigibi.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/4033550163.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kiwowinowet.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/84173468188.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_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10468 bytes
SHA-256: 67bc94697457dac59c4af3dc1653cb05bca5baa3b9d898ae2104fafb2b90772e
font_02_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16456 bytes
SHA-256: 5a11633c6b2c496cc61c538b4729fdf0d5c38edf3edf3b4a8b7c4dbfc11eea3e