Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cca61cac258697…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 10:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6eb4a5e6a8887c1ca36d71f3ccb8a92d SHA-1: ca309fbda5e0211cae8d584725590a91547b9b6d SHA-256: 72cca61cac258697bf7bfc92ef6b70f96b710814475769a4ad5eb8e77c6f0e43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dlabiura.kbo.pl/ckfinder/userfiles/files/bakoxadefatifumuzavirepil.pdf In PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/rafobubuji.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/42195590916.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/08/suveziviweboz.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/wakuvewenuwuvixejojum.pdfIn PDF document text
    • https://kede.org/userfiles/file/dupasasizunilakaputadamo.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/70504676820.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/39260304724.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/64845569946.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/717471961.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/bomapozubas.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/potiferufib.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/31010984695.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/fazeboxolewiw.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/keruluxiborewejupuw.pdfIn PDF document text
    • http://m2m2design.com/userfiles/netebebiridiladefe.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/pobem.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/7990167491.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/binisinuduvikurowuf.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/78f523ea75863118a655d7307a53c010/gunit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+apps+for+rooted+devicePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7904b08956a13b9dec4a56618ff36577/tebuf.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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 10580 bytes
SHA-256: 12e76392035ffc39d00e5dd92355411e8a3ba468a9099f1e4dc12429843fa30a
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 17012 bytes
SHA-256: 9e31e6d38320c9c84da54f59b727e423fc00ab2389f293dea689ed4fb3151bf5

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