Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6914e15cbe3f79c…

MALICIOUS

PDF

81.7 KB Created: 2021-10-12 05:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 047e5a6b04a78c6e9f85a148d665939a SHA-1: 42d2b5f27dc84a7b462e42572d809ca1b191de93 SHA-256: f6914e15cbe3f79c2d68e1b1bf0efa2204f14ea6238c182ddd568d8cc2cbb388
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bunyaminerdemir.com/resimler/files/41065419379.pdf In PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/24675198424.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a073c7da7072e7426c7b5940d60bd553/39342146301.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xenopisepomazipegozulol.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614111b812379---sajinabukediwuzopakukidi.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210925214844_9kfyvw.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-28-23-07-21-2Qkg1B8M.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/tazatofeterazu.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/fusaxasaxo.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/mupovanumojazaleda.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/59894934439.pdfIn PDF document text
    • http://candientushinko.com/images/file/kejapaxadod.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/fisaluxafejuzipafunit.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/mepetajemegozuvopetexi.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/geludijevixoxifavava.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/82044560868.pdfIn PDF document text
    • https://eniedu.com/data/file/20210916160830.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/nagirumapural.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/33931625597.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20211002160429.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/nipawojuguwelezaxos.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/fadilab.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lexewujamivigaxasemad.pdfIn PDF document text
    • http://0851gay.org/userfiles/202110file/2021101113185570554.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bilixajuwebew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=functional+organizational+chart+examplePDF 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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 18068 bytes
SHA-256: 13fabeab610b18fc256d7007a641327bcf57e5f672fb7504af74fc5a3abce27d
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 10892 bytes
SHA-256: f922e8f12b3027ec80b7ed35931c66cd8221770f2ce2efa5a2bae44df29dbf9a
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1