Malicious PDF — malware analysis report

Static analysis result for SHA-256 9955141dabbcd91b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 18:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35f4af7eb78577d91b8c19ab23acd1ce SHA-1: 6c2e83d36da3fe34e203fec734abe731fdb2346f SHA-256: 9955141dabbcd91bba3e2b8d352fa8795b130d08e6216eb4cd0e11f335a35308
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and a large number of URLs, many of which point to PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript likely serves to further the malicious payload delivery or obfuscate the true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://naturalwonders.com/uploads/files/27565229970.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0131c7002---minusedubegejitezarem.pdfIn PDF document text
    • http://e-menu.hu/editor_up/25298430411.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/soboledezojazopozazo.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gutaviti.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/20759190269.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/94633820733.pdfIn PDF document text
    • http://alkanboya.com/files/file///tebane.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/37382276363.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/musufenalasifi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nowofo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/10349f18bea5b310a247d377b51f0d50/puguxiduponobonepalaminep.pdfIn PDF document text
    • https://angkalaris.com/contents/files/85946694023.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/dezalip.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/57015036340.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/30630676791.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/89958357999.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/vakifajesatajinejafaxelik.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/4626909771.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/gawofaw.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/marejifed.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/xidinulumutumaligexur.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/wifune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+theme+materialPDF 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_off0000be23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 10328 bytes
SHA-256: eb6ae3e84d2037d4bfdde87de3b87b734f9a4c69d51fa6fb6d58e927e780804f
font_01_sfnt_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16436 bytes
SHA-256: d7fc7fa915f561853a86629039ba7243358b06e549227359a294b5d5f6830a97

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