Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98125259e0fdefa…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 12:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa2d12bb8eb029d462f8d99ddac25010 SHA-1: c2b811eda7d02bdca664c1fa2108f3c73092147a SHA-256: c98125259e0fdefa4862dc503f373efa08ee51d544510858932ef3f768e13d66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ww150002.linebot.net/upfile/files/20210906010204.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139840b20f20---nitinakedesarixinipine.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/muwas.pdfIn PDF document text
    • https://jck.ro/userfiles/file/18559593877.pdfIn PDF document text
    • http://guitarenko.fr/img/files/90405918134.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/nififopeb.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/96867666426.pdfIn PDF document text
    • https://premiersuli.hu/files/files/72085264644.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/lufexefunep.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazilumubigofufu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sazubagoraziravenibumigi.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/vogalir.pdfIn PDF document text
    • http://opersan.com/file/galawazigevipipilabibedup.pdfIn PDF document text
    • https://coil.hk/upload/files/81094410962.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/mapodan.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/30360e2e837a5ebc80b9a643bda3cd41/41196630077.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jonegaponamobenatogajen.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/gepadukovitoxizonodanig.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/22370907172.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xikedowevane.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/gobewijepaperejuzugalukap.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dizexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+print+to+edge+of+paper+in+pdfPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 18012 bytes
SHA-256: b32ef244dbb41dc595fdd0a4ef62658f9eac0df4796fafca74448170864c3f03
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 10536 bytes
SHA-256: 85ebf72adf7cca576c37200220077430e5c72da2fe1f0d3aa26eaf3928eaa95f

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