Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cde9f9cbb4f8b3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 03:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f2b903b3d3300e77b06d9d3dc5e7f4a SHA-1: c9387c4b9cf2400238d3bcf27c17ef97a3c6392e SHA-256: 65cde9f9cbb4f8b35a49f45525c40bf1bd5e207c5181103d2116e5e681025db9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to other PDF files, suggesting a link farm or a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://searchlink.org/userfiles/file/vadokewuvi.pdf In PDF document text
    • https://mintowncoffee.net/uploads/images/files/dilibovumetulenapezu.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/neziboparunananagusosezam.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_144745.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168b4910ec---96664647249.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/15444778276.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/jedeviwekobi.pdfIn PDF document text
    • https://protrialse.eu/files/files/kivebemaginetuw.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/gilowutotudopi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wuxusuxexa.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/25607563396.pdfIn PDF document text
    • https://priscar.com/documents/files/72050822953.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/48591111894.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/sinidemefiretuv.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/baroxemijamodo.pdfIn PDF document text
    • http://peoplefoster.com/pliki/dixuvu.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/15568263979.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kizot.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/71978042568.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/nolaluxozon.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/rafarazopurotas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=invisible+text+character+copyPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/pojamepe.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_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 19808 bytes
SHA-256: eca4743ad7ee245b484766780fa8bc7cfac1cf2d7b5a83f2c24c7e71c105e83b
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 10844 bytes
SHA-256: df484fe624a576f6fc848ae9a6166b817aad89893fbdb484c9f93621e613592b

Open this report in the interactive analyzer, or submit your own file for analysis.