Malicious PDF — malware analysis report

Static analysis result for SHA-256 953283076fae4229…

MALICIOUS

PDF

89.6 KB Created: 2021-09-21 05:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76617213de4d5293a5b21a6807fba8d6 SHA-1: 7e46d00e6ef69bf8e4575d659fc6a1a98ef8455c SHA-256: 953283076fae42297de2b4afcd922274ffcfb5a55a9ec51d941ca88f4d42e879
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rkmaster.ru/uploads/files/fosominu.pdf In PDF document text
    • http://standartbio.com/fckfiles/file/vuvekejapu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/jorijaxuxera.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/xibafixegesuguga.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/53291198919.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/fonozexosozimodid.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/27667786603.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/73444178907.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/89203424564.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/lakuxawilonato.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/farebuvovidegovarukawukel.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/62360221329.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/lanesuwefukifu.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/77229261404.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///80371645226.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/zosobo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/turawemagejotesatuzor.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dd47673c1d1993dfd6ad88e453fb9b0a/gegatuw.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/xegojiluzarabenulunefam.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/lexewewelit.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/65837397742.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/varigojebar.pdfIn PDF document text
    • https://logcabininn.me/nbloom/fckuploads/file/vukanivivoganopofefel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=orphan+full+movie+unblockedPDF 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_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 17848 bytes
SHA-256: 2c2c7e2f84cc4cfba801d98d3bd1753697b8bc22457abac23f10a64edd26f867
font_01_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 11044 bytes
SHA-256: e5a1e1c93a7519b99b8a219b227fabb269cf975dc50fd75b23fa9d326c413d55
font_02_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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