Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfbeeb6164e4afc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 16:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1d3ee3d74d6079b72e564fb7312b5394 SHA-1: b3b99fa3be5bbccda280372613b0650ae52556b3 SHA-256: 1bfbeeb6164e4afcda876090f02c8c4fb7550ce589e9132ecf8c03d6f4a3ea8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ysh.my/userfiles/file/mopovineroxunu.pdf In PDF document text
    • http://hk-keber.de/images/file/28033647862.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/vujabovatexupixu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/fafut.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/levaxudixixovowaxubedaguj.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/wejuf.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/vowigalemuzig.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/tazigezise.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/66054085324.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/18818539432.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vijinatome.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/gexasenofefazenub.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/bikoriwovutiwimukos.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/lopedapadujejagugev.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/guboput.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/16680088989.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/bofotisifelixu.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/nivujaf.pdfIn PDF document text
    • http://totoumi.jp/upload/file/30810635713.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/vijezesigi.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/74879072792.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97429634951.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/zaluwowutonafigiwipoxuv.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/mejezagesod.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/39068631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+space+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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10620 bytes
SHA-256: 2e5ee1604e4f11d1d8fa04949426283b48fd99ecd9861d55b62abd9bd6dd7e8b
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 17804 bytes
SHA-256: 5f566f7daaa883860367709f3b3a95e010417cc261668d1c7c49854557ddacbf

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