Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23cfa820869d471…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 09:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f677cc27f8290ea882f26a6e1b38e2a9 SHA-1: 716f500f8e8a95d77418dc6688e37b316d89c89f SHA-256: a23cfa820869d471378cced889beeab81ce52122847d87c68ffccfd5678e87a8
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 suspicious domains and are structured as link farms, indicating a potential phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a pattern of disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://grawerlik.pl/userfiles/file/9032017521.pdf In PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/4282773879.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/52907076221.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/meradumofalewifiwuno.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/dojavazevunatofazakojowi.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/24808814700.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a28a7ba25a0d5e7506135124b99abe57/bupufow.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/pawak.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/63793222385.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/20590662410.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33d661367---lenuworenoxuwogomisek.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/baxolu.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/lorofokuvez.pdfIn PDF document text
    • http://runhouchem.com/upload/files/genivamunufat.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/patozovifadazuxisoburoj.pdfIn PDF document text
    • http://shamayachts.com/upload/file/totidifebovoralaxodug.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/sekusedukijumelapamadel.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/80776132569.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/zovulotapowibokevulel.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/butulusizurijofafo.pdfIn PDF document text
    • https://wita.lt/images/files/sisekabaretafoxufopak.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/giximitoligetiduku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=need+for+speed+underground+2+iso+ppssppPDF 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_off0000beb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 10564 bytes
SHA-256: 6043385466d7ab48909c6053bfeb83f3eebdb98e2389ea9883ce9090fe7a4412
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 17088 bytes
SHA-256: bb8ad71d9a37b74d48fc055c77cdbc4be91bd184abc3acf65dbcaadde9a47ad3
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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