Malicious PDF — malware analysis report

Static analysis result for SHA-256 e508478cce9ee757…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 15:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b978664c2302ae84c71b65cdff8bdf64 SHA-1: 579c18e9d3e08953c65603069c67be459e7510d9 SHA-256: e508478cce9ee757d26654e1e4ccb79a943962a361078d326609f68909ff2651
134 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and numerous unknown reputation URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are designed to trick users into downloading further malicious content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dailyhondaotomientay.com/upload/files/sakejarujedowitosuw.pdf In PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/82286574213.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/wamemosojez.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/44400003692.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/sovedidimodugi.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fujef.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///fulosodulubaropinipaw.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419371c7a84---nunira.pdfIn PDF document text
    • http://1careglobal.com/upload/files/kupolimatumixekogobuvi.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/37555246235.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63469948990.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/napirubifagozoxusixuti.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6f625b1b4db276f8ba8c5e06e7048e42/rumefotimukan.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/safajomaxav.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/sabiw.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wifemubofemudubudutux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/87238287369.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/93039294847.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/102171411.pdfIn PDF document text
    • http://hkacca.com/userfiles/zawiwadeg.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/mozopiguziji.pdfIn PDF document text
    • https://rosycaffe.com/file/famikabat.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/85665313440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=proxy+mod+apkPDF 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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 22476 bytes
SHA-256: dcf1fb5ff3913d1a49c475041ee34865d3bf3646adef5c7d0b1da4a67b264be6
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 10224 bytes
SHA-256: 7828696f3b09352441f2e98f7baa9e3806932c792eb1e2f060a45e6fd3ec0fb2