Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d70b8ecc47a2a46…

MALICIOUS

PDF

88.2 KB Created: 2021-09-09 12:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed90b6c84d49c6460c129460eddbc286 SHA-1: bd17eec57f2bc7125f65498c06e81c111c5de56a SHA-256: 2d70b8ecc47a2a460678e78cecbd13bc8be034bc0ae48f8f5c9ee7c381f9286b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://minlinart.com/archive/upload/files/gimivivitoz.pdf In PDF document text
    • http://erbamedica.org/userfiles/files/13145156993.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/rovexa.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gurabanulorimisebo.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/39709622886.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba66ad7b---xegajimar.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/34761345029.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/48761272384.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/kevimowi.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/newidanebesonejamukevedos.pdfIn PDF document text
    • http://cssh.es/img/file/nadofizitusi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fa65033bedbede8dfb3671c2363a087b/busejobelidofer.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/52702107644.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokazoxabikulidiwepu.pdfIn PDF document text
    • http://tyextractor.com/d/files/mikowelusuxojowiza.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/54657277101.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/68983381703.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/39352525373.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/95462706199.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/82909262175.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jepasezum.pdfIn PDF document text
    • https://yasacompany.com/upload/files/gedujafejo.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/sufesavenulusig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=indice+cintura+cadera+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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10332 bytes
SHA-256: 801697709c274928090e183346e972a8dbac22089f570936e3b1ed3e0eab6b45
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 20368 bytes
SHA-256: e7896a5030198d774d530057fcf0b25ef0ae5f5398930c84b144b47c5eda3144
font_02_sfnt_off00013b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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