Malicious PDF — malware analysis report

Static analysis result for SHA-256 257e853ebf7b329e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 15:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b75d4bbb04e12c4a8512fe0d68bd5c27 SHA-1: e033d04700e40fc977e69a760de0d6898774f543 SHA-256: 257e853ebf7b329e2a15197509ad6c86736bb64a4353735068b7e0984b72d457
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=how+to+change+bigo+location+iphone PDF link annotation
    • http://pegastelco.com/pictures/files/42016768495.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161047459916.pdfIn PDF document text
    • http://elpijisystem.com/file/xugepisodemokasesij.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/mesozetixag.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/97420093439.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/tejiregovafixejagetowamu.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/56600878305.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/pewijorifuvuzugada.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fafade.pdfIn PDF document text
    • http://lovesenergy.com/file/28817842477.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe02b57d0d---81449609209.pdfIn PDF document text
    • http://insei.eu/userfiles/files/duzebeg.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/jorobelowudo.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/78024342531.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/zupixofutebim.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/39596611571.pdfIn PDF document text
    • http://chinalabware.net/d/files/30119792679.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210916015149.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/zegoparilazedoburad.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/82669791005.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc99245061---57266585239.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/56912335357.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/pakokividonadexodom.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_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 18676 bytes
SHA-256: 0cb94097d5eb06376863ad33116f55cee6cd23f22f5737833d02a2ffbf964a4e
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 10604 bytes
SHA-256: 23f93210d66ace5e95c194b171ee250904465b6a7953660a8823f51fbd12a5f3

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