Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c5c7c9728fdf1a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 01:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d8c488f6da1a0f078d8cd3e8d584e5b SHA-1: 9f4641411432ed3f41d791071eff6bf2bcdb85eb SHA-256: b4c5c7c9728fdf1a04f432a365a9afaf0261dd0f00b71b2403219cb3848bf31f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and the presence of many external links suggest it's intended to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://journalofcritique.com/ckdosyalari/upload/files/sefeditorukeroka.pdf In PDF document text
    • https://growyourmoney.in/userfiles/files/50214253114.pdfIn PDF document text
    • https://yellowstonewildlife.com/lanevixusoxu.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109171212303612.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/3845592689.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/zetudozapon.pdfIn PDF document text
    • http://tcihk.com/userfiles/15027851677.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vabunaso.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/50420197403.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/puwugimidelovalojulu.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/79177388923.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b18ceb864---16341397954.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/75553946804.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/36046495026.pdfIn PDF document text
    • http://julianina.dk/upload/file/48261301370.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/tafopupo.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/tukawuturasopamaxon.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161375b269d0cd---muzobolorewuvux.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xolifuxavigapipajanebofa.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/texagati.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/zasalajev.pdfIn PDF document text
    • http://telektrans.hu/editor_up/vufuzas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+save+google+image+on+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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 17064 bytes
SHA-256: e415ae2d6e200624adeceddb434bbb312b9b0d535fb2ffdf51dd5e53a735d62e
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 10732 bytes
SHA-256: 62fa1e07f9174bf66ab71f9423a18a62ff64d006743d71e4a6deb91ea87d61e8
font_02_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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