Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4308ecad458a7b1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 03:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d0aa09c836ad8003b8bd9cf91730067 SHA-1: 15f07ce9b7975400955550ce0c6c24b38d4dbdd2 SHA-256: e4308ecad458a7b179f78e448c1fa616064f86bb08368c3014ae2f16bc493012
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. One heuristic indicates a 'PDF_SEO_DISPOSABLE_LINK_FARM' with a 'utm_term_redirector=True' flag, reinforcing the idea of manipulative linking. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://infoegrafica.com/userfiles/files/jofibiwuna.pdf In PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/85984062389.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/puvevepog.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/womixud.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/paretinuxemufisemadumo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/46165754204.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147096c364f5---gimelusawepo.pdfIn PDF document text
    • http://puisan.ru/uploads/file/vafofudulaxuwezopetojujo.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/10812544390.pdfIn PDF document text
    • https://advik.net/userfiles/file/xoxopizome.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902020054.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/somovilowudirikufekovon.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/jofibuvanubomajaseje.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/voduloge.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/48339018060.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/suweduxififibuda.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/xuwimizolow.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/54743848761.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/85743674650.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/34910819588.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/woxilofajajivejegefivupig.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_231738_190.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302c9606694---58126714503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=you+now+app+for+androidPDF 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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 17864 bytes
SHA-256: b59a1c55126fbd0150eea5a3937f5508d6da4cb9f7b0da4a6bb3a81b7e7c078d
font_02_sfnt_off00012799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 10216 bytes
SHA-256: 41c0d1c6c61553cfeaa0d40ada1237b955c849a8db018607daeea5a26f1a25b8

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