Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f5cfe020dce80b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 04:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59e51b73f1b2bba311ce5a52a429fccc SHA-1: 7f8136376077352114462bde3c0ad7665ab04692 SHA-256: 55f5cfe020dce80b2351ac576efb2a00e20b2d266f94b620ecf7cebcada6e3e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users to harmful content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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 http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95855506909.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_A630D8712A0E4B96.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b0ae4dd.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/demitexakipuzokuvi.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/disebudubokabutig.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/lasurosixujogimoxete.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/97345143007.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/90744580690.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/47627830543.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/46030526383.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/64343696142.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/55460452139.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fce6e928e3d4b0715a291f2da633104d/33421547130.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/65389583588.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/remapev.pdfIn PDF document text
    • http://kco.su/userfiles/file/mavudamukunadopuletel.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/vidomamifiwi.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/23198013833.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zawosajuk.pdfIn PDF document text
    • http://kodemari.info/data/files/jebojojoso.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/xefururiperaladesemoz.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/batazasuzanufaxakajax.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/98905485755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=thoptv+apk+v38+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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 10584 bytes
SHA-256: 3e1a9af13995d75451315f93139ef6c29e17639f478483d726af37ffc1350f26
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 17324 bytes
SHA-256: 3ac3ae7842e39529ae5e44db9bcc6d434b4eb53f0c342c8a1bf986b5aa55e0ef