Malicious PDF — malware analysis report

Static analysis result for SHA-256 644df698a626e347…

MALICIOUS

PDF

78.4 KB Created: 2021-09-21 18:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e83b4bb08667bde68f471f9e5b3a33c SHA-1: d522fe8f3e44e3938bfd5a5610b49e39a32c0348 SHA-256: 644df698a626e347a1263cb0d5302764a953da19495b868074806ad6547b2ac1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrustworthy hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=extreme+balancer+3+apk PDF link annotation
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/bevaf.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/jejufizefabulasatinupoza.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/puluwurov.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/68acffd3d1ea33b3f505e6145809b557/99541425440.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/93242998096.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/kinedajabubukefupixiwinem.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/nozinuzegotugiviridana.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/zojewivefurusudomenufop.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/28255492154.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gejarotibozaduwuxul.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/dakaposowijavufawavodemi.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/defuxigajota.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59be0017a---2566820587.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///35807023916.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/38506272203.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/49125537262.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/bojese.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/nugenev.pdfIn PDF document text
    • http://sdes.in/uploads/rozez.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/82362443727.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/48106090903.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/3117371962.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In 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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 10644 bytes
SHA-256: 69885dc0c589fd32db147ccde7ae199f8554d0ddc035532f4cc865755ac1a776
font_01_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 17332 bytes
SHA-256: 481ceef6359be3d538bac9c242aedb8ce08d445d1a67dc6b8f45ff08ec1a1cb3

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