Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5442a8eec967c8…

MALICIOUS

PDF

99.0 KB Created: 2021-09-16 04:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25f7786d85ac94826d745b7cda49c87c SHA-1: 23e2fa4acd736e7134fed1b55c7e17bddbf73b3b SHA-256: 4f5442a8eec967c8be961fedbb69ffb897e23f8147d0ec80f1e5bf21fe632016
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to potentially compromised or disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://heldermusic.nl/ckfinder/userfiles/files/vosigojuxixevulanasedene.pdf In PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/69111247696.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/duludakasobumos.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/39161577404.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/durejiledabujanokelereluv.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39f34d74d9ca609b5d8cac8379ccf046/woxadum.pdfIn PDF document text
    • http://compsult.net/userfiles/file/13370418400.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/73191521823.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/rapukunijatadanonowijew.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/20583589533.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/robuvavagigegem.pdfIn PDF document text
    • https://parkettworld.com/upload/files/93815663986.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fizako.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gorokalixazolenek.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/75298475882.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nipanoxifepexew.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/rorufowomeloganug.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/30560581283.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/10349029808.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/1182443241.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139673403951---40299641420.pdfIn PDF document text
    • https://somogyplusz.hu/files/71159142706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hacking+games+app+downloadPDF 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_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 10828 bytes
SHA-256: 05523cc503b7add151428d14fa9904a991fe94c29b108876b5d4d7fd4b2b1337
font_02_sfnt_off00014401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14401 22104 bytes
SHA-256: 46dec4a3f9146f30f383b58e1d7e41301e3fd922baf1ec541512bf9d3ee304e4

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