Malicious PDF — malware analysis report

Static analysis result for SHA-256 594ca73bd7f2667b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ae6a21cf977243582632716cddd8c1e SHA-1: 579aebaf667e2a92dde679bf3b7750d43d9d7ec9 SHA-256: 594ca73bd7f2667b7ff252e5d63c76b26d544c728e0859331ff7ced7813c3627
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, and numerous external URIs were extracted, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=apa+7th+edition+textbook+citation PDF link annotation
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406bbe49a0d---82074906748.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nifabu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/21720116268.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/16474659435.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/27229441304.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/98775878575.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/63146387443.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/faxafesivu.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/76476938060.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/4255549166.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/texubunubiloxuzazowa.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/jitugulaxam.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/94475744814.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/ginuvajaxujime.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/kuzas.pdfIn PDF document text
    • https://olterus.net/contents/files/20235057952.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/negobixapisanugofafu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fad9a5305fbe1c023bef52c2d1f0933/68243943502.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/98566644008.pdfIn PDF document text
    • http://grandfiltr.com/files/file/18963814234.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/nibin.pdfIn PDF document text
    • http://matras-devison.com/upload/file/6238828693.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_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 17932 bytes
SHA-256: 41e4c63c3c305b5167a7e6b7f0ceea4b1e36dbb313d499887d3fef641961a497
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10660 bytes
SHA-256: 466c0e2e4d2bbf86a44656f398b672670741c7f8a4fe4a4ae97b744b8fa7c227
font_02_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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