Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a6858fdc438b79…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 01:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: faa928ebed8ba47f202a64278943f62e SHA-1: 1c212353ec46f37fab6942f801a9ac5206381e7b SHA-256: 38a6858fdc438b799e672f7f998d7421fb0f5564d07da77b42af7e76042f4157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it may leverage PDF features or potentially embedded JavaScript to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://alituncer.net/userfiles/file/xafiwitegal.pdf In PDF document text
    • http://montazerangroup.com/uploader/file/77648533011.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/kusifigi.pdfIn PDF document text
    • http://sin-hua.org/userfiles/mimabajakafuwol.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16155e30238b3c---91833380727.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/kirizubepulakagap.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/wonirepiwajitupumuj.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/93859653007.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/lalulinoruduwezisopawa.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///sidevigup.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/51284853667.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/45713631169.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kobosij.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dizizewer.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/zapinaliki.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/mewofutewafumese.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fobalowutovunus.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/5299222570.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofilatusiduvubuxifoda.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_150556.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/46095925021.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/42203698424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bajirao+mastani+full+movie+freePDF 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_off0000ada7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA7 16148 bytes
SHA-256: a33874924be18305efeb0212acdaf345034cab2287b5a9c81e3180b7db0ab2d9
font_01_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10724 bytes
SHA-256: 2a50caf47534025f2bd10a1b8930e8ded0e9f85f2c364fc2311897b47bc8779d

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