Malicious PDF — malware analysis report

Static analysis result for SHA-256 635a0cf7dcfe444b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 12:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6b0eed262d962dac22664848bd1d3d8 SHA-1: 25cdb499011ecc2efd554996fc1e400f1cf006d3 SHA-256: 635a0cf7dcfe444b3666ec8a5a477ff5bad22de19e1065853bd47a2c19907848
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goez3.com/10005001208290177/ckfinder/userfiles/files/bevobufur.pdf In PDF document text
    • http://maximaviajes.com/FCKfiles/file/47501259045.pdfIn PDF document text
    • http://bronia.org/userfiles/file/52104981647.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041324354781.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/17562751907.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/72578250729.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/pubesedemoseloriwevuvit.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/76342368743.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/luzifafegomuwofaga.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/tolufimenanilomuz.pdfIn PDF document text
    • http://poultech.net/d/files/33083695204.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/60955801869.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/wimavivipafurizenoxarita.pdfIn PDF document text
    • http://citty.org/images/uploads/file/75145540089.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/75576724171.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/lemorunolapupagaluvom.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f17170e9---41475594564.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/kapesifetejar.pdfIn PDF document text
    • http://markone-tools.com/upload/files/42529903577.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/85843215880.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/wawize.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/tozulefezomunex.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/rejedinefojisegomajan.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/19363608448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=why+is+my+play+store+not+downloading+any+appPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 17432 bytes
SHA-256: 0a2b53174cfa3db526dc4145462af4e42f591c3c80e9f6c40d25455f3ae9ed62
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 11032 bytes
SHA-256: 18864ea9ce28e4910bc05df11839a9ffe2aa453bf2577a420f062961c187c04b

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