Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec4e85f61ae2ec5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 11:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d541cbac684563962dc64fadc270f700 SHA-1: 70be7ecf667e91fe09a82abf8589983d4d22db38 SHA-256: fec4e85f61ae2ec50de7c554966a8bcb584488e18558ee580236e41a5e441b62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are on disposable hosting or redirectors, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=active+vs+passive+voice+exercises PDF link annotation
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/rakorenidavubitanasifiwaw.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/kilafinejetujelaw.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/37190098006.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/dukajufusefifojini.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/bigepowow.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/sijuwuxozijepaxo.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/90059549576.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/lulamal.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/3372322686132999e8b731.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/zojeridagaz.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/tokaxunafusep.pdfIn PDF document text
    • http://popmetre.com/news/files/22947865500.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/88819348207.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/67014610033.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/darogalibedonakiwoxip.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/20615804371.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/12601536581.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/35051928062.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f1106bf5639e4eb4613ba2e5841f707b/kunesulivoziki.pdfIn PDF document text
    • https://polaria.cz/images/file/12679325553.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109100953295518.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_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 10368 bytes
SHA-256: 03a8a667c6af621fdf0dd6606579c0a5ca0091ce9e5361bfba62e568a3dec065
font_01_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 18116 bytes
SHA-256: 1082f60da90ba3f77d9408546bcfd1bd18520346b1bdf1dfd1c26b8aca9208a0

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