Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6f4cadb95f1464…

MALICIOUS

PDF

81.9 KB Created: 2021-10-05 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d1bbfc13b1d4e3efc798cdb4e9ad2cd SHA-1: 5b3214fcaf74e1ee295d6b2f8b33cfe652e44ed9 SHA-256: 4b6f4cadb95f1464602aacaf37b4e7353ef0a512436722122eaa2f73e48dd7a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. The presence of embedded JS points to T1059.007, and the overall nature of linking to external sites aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=horse+racing+aintree+today PDF link annotation
    • https://2winit.com/Files/files/61594707226.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/tevifekokulapanidaru.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/wonumumefijakazugo.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/82038463996.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/tepumisiwipiwopisufiw.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/gexedugopowiselebatunewi.pdfIn PDF document text
    • https://kristinanamaste.eu/files/40231421182.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/24993414982.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/49174154264.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/88560083284.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/tepaf.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/38f4a88ba8202e579fc2c10396d135c9/22083977160.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/pukigejewi.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/vuxarodiled.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/kakutumekasi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686063b620---7382521761.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/busarowawor.pdfIn PDF document text
    • http://tzsunup.com/upload/86879487705.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109151454029532.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/kumujipotefurexugerotem.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210904192115912.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/nivezokuwo.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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 10604 bytes
SHA-256: 6497a071084d2e34cd936efe1399546ae2ed574a48fb961d5e0be68b7030232c
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 18852 bytes
SHA-256: 9e0a48ed2635786a560fa5ff96ea425875475fd78656dcba3ca8c67c996000a1
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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