Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5b68314cf56e72…

MALICIOUS

PDF

72.8 KB Created: 2021-10-04 23:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00b24ba462865426c72e8dfbdf074c34 SHA-1: d5c51b030d53acee348982f5eeb036f537e93149 SHA-256: 3c5b68314cf56e72036f5ebfe8e1c4221fb8e5ddafe4a3c1807cdec885dabc16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=workcentre+7845+manual PDF link annotation
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rameluzadudezegita.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/lopusenevusunav.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109221152538570.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/lepuwidubupisu.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/1647188951.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210916095709.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zuzaneru.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/dibobamalukiji.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dirimin.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/dumilagubidofevumiwo.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/vuvat.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/31259448379.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101749459890.pdfIn PDF document text
    • https://upaspor.com/resimler/files/20144247375.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/fetaxivitiw.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/41373274958.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158773674e81---89258623954.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/81006094015.pdfIn PDF document text
    • https://laps.pl/userfiles/file/beban.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/xamogoz.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/fewuxunot.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/20848303119.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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 10788 bytes
SHA-256: dd74f8cee676d06fbfc2909dfd7237aeb69f5fd9d912ca30cd1bc38246f01d21
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16740 bytes
SHA-256: 15a67b54368be72edace78f6bee7089bf93e29b186dbed30be299d8d49b4f44a

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