Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55f5d8eb2a7d931…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 06:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a071f6baf509e314ef3626f26497c9ae SHA-1: 09d3d3fffa0ed519a9494bb1f6d8e1a571bbbd13 SHA-256: d55f5d8eb2a7d931d6c3548d5d19e1c2bc654feb4edd86db12e52b36f4c024fb
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, suggesting its primary purpose is to redirect users to external, potentially malicious, websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adrfarysz.pl/userfiles/file/16562272399.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/58838744103.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161458f8a47ac9---rotewazamipizakevizo.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/biriwijel.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/zedeved.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dozajajoforofo.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/97935692114.pdfIn PDF document text
    • http://grandfiltr.com/files/file/tisaz.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/tirevabubizudusub.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bereb.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/17073447169.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/kuzevipobixagixomo.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/50180650036.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/37582072907.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/gusosebabilesi.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vetivozor.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161375f90d5a83---87568667234.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/68333798837.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/42196843828.pdfIn PDF document text
    • https://85097781.com/upload/files/wowutofukedop.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/49214151891.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/38661907407.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/kesujo.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/kawijesimugabop.pdfIn PDF document text
    • http://erex.hu/upload/file/59896210665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+prokaryotic+cells+differ+from+eukaryotic+onesPDF 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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 18948 bytes
SHA-256: 18bb5a6841347e493142a72aaec53d5a7c931e3325e5f56284d9177ad150080d
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 11164 bytes
SHA-256: 1a1a82441092cfe01b5e797097b7917f95ba619d5d5c9c09185521ccd281b1ed