Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb655c3d2390129…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1f85211f7ac883e4e752af780854900 SHA-1: 444ebe1e129ef38317b36b3e5d275682083627b1 SHA-256: deb655c3d2390129b21dcec1e79bdf82c480472c04b00dc7514c8449603353b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://foodsafebox.com/ckfinder/userfiles/files/61028581555.pdf In PDF document text
    • http://fujiya-la.com/uploads/files/xotonigiwol.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/24639426780.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/gatexododukibetejo.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/gitifosunujafavanutifab.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109050756098965.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/45093348758.pdfIn PDF document text
    • http://iknow.pl/files/file/werekinekofa.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/tufagajuzaz.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/luzopozebibiwopadoboves.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf4ced918---83713866822.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/18281671359.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/61991406661.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vidifomipigagawavojojif.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37828869529.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zavesigedowazuzaxunuv.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/gapawogowuj.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wupexojinodaxelazew.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/zugisudofatepukurufufabo.pdfIn PDF document text
    • http://nemochem.cn/upload/files/guvovubugudi.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pawolafopojovave.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/98178117493.pdfIn PDF document text
    • https://cargotavio.ru/files/file/5493795223.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/fb11ab203345fab6a20f4f1df65622dc.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada4bc1a00---20532374628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convert+html+to+pdf+in+android+programmaticallyPDF link annotation
    • 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_off0000b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 16680 bytes
SHA-256: e98faa0f84cba426adefc62232a5b253755f7774e442dc6c72fb4e5917bb127b
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 11112 bytes
SHA-256: f68791f2873f14b4d8e7f01d24fb3c67387551cf353f490327fc3c051a4fe6ea