Malicious PDF — malware analysis report

Static analysis result for SHA-256 07df3d1c5a4069d3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 08:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: df1aa96ff88db72a792ffa619ed465cd SHA-1: d2f81c71165c9aaa18210ee85ff25de97a7e81f5 SHA-256: 07df3d1c5a4069d36dd5f5d35f6ae9a4ecb15bcb9da9bbd3f0173b1bd7688c82
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to external, potentially harmful, content. No scripts were extracted, but the overall pattern points to a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 4

  • 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://www.ijestr.com/ckfinder/userfiles/files/60645147024.pdf In PDF document text
    • http://architettotamborra.eu/userfiles/files/tujomewotewilokigeluxufe.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/nopagikaji.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/99218989778.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/59477275466.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/6087598208.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/92804573307.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/sasudugususipesuzifajis.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/javafatosezudegivofimexev.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/jaxodoridejafivuradizutes.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/mezon.pdfIn PDF document text
    • http://zeci.nl/im/image/20197642180.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/55255844038.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/72581869963.pdfIn PDF document text
    • http://kunbot.com/upload/files/wojibuku.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/doxos.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/pupopulopirevolowa.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/71735268885.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/53198795412.pdfIn PDF document text
    • https://computerzone.pk/file/zelodosapisovu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/poduvumetexuxofufero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=frozen+fever+full+movie+onlinePDF 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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 10152 bytes
SHA-256: 8dc4c81be192df783d06f52bc4ef2603cb1c9b339ad569e02bbc1c6f62f87dd2
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 18188 bytes
SHA-256: 02db5a5df7d930ec97e9cec0a5311cd084744c38cf4ff9e7c4c47558d80d5865
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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