Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be9c1279af8c101…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 12:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1be389d2d4148d7412fe28d3bd8ca42 SHA-1: 5797e972adc42af051c58dbc825f8e853f490969 SHA-256: 3be9c1279af8c10147fa243f8a493b0cf0a1f1e07e9e2b58bf0a4d9f50ffc06d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common vector for malicious activity. Heuristics indicate it functions as a link farm and potentially a phishing lure, with one heuristic specifically flagging it as ML_NYX_PDF_MALICIOUS. The embedded JavaScript likely facilitates the redirection to malicious URLs, as suggested by the numerous unknown-reputation URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/55805897098.pdf In PDF document text
    • https://etadelloro.it/images/file/11264952404.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/kefezawiv.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/xoladegapiparedakex.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/94935280985.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/7290319085.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/90917854659.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/5177143788.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/dokafasoxurafiridu.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613a76b004c5e.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/jekivujuwijesowu.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/61307541488.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/18380271644.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85259788973.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/88900858405.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/85014503094.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090705361121.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/kubedus.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zuluribexugosobelinada.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/feripogubulidos.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/64908967617.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/nutetuzudadewad.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4507271b9---xukunikadibukivul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+korea+hack+mod+apk+downloadPDF 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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 18680 bytes
SHA-256: a26ae03bca8740c7853b265f31883a0fb7edc150c09e7c4a2a1622ec8fec6dc4
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 11020 bytes
SHA-256: c69500741afc1dd9d553d63418f7c830f80161ea41bc4fb6a8bdcc0638bc583f