Malicious PDF — malware analysis report

Static analysis result for SHA-256 15be8aa11d6626c2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 20:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcb26448702fcc5679f97db4d9cd6aab SHA-1: a48dff847bbd88a26c4ecfa21e1f1e30fa701a05 SHA-256: 15be8aa11d6626c238d51437f9db51a9a01af8a66098e0d56263166ddbb54509
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing campaigns or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://przyrodnik-kujawy.eu/userfiles/file/riwomutenopurifilisuro.pdf In PDF document text
    • http://servmed.net/userfiles/file/62003526958.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/toginulebikagevep.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/sugujata.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/98180089585.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/kapalumuzinazodabid.pdfIn PDF document text
    • https://priscar.com/documents/files/28479006067.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/womejesesunatulowetibe.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/76352206633.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/zuwajo.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/95740184756.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/vinuxuvi.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210903235937.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/wowadikokibo.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/94429089144.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/19624695683.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/14381728955.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/pokedani.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/suvamadubolegawidiguja.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/377174bf5f7fa6ba427a16112666f3b4/93064558948.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/tapejipimoridifenabowet.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/sixuzara.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210907_378B542C3D0DC630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=2020+lincoln+nautilus+brochure+pdfPDF 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_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 11104 bytes
SHA-256: 52bb8b478d558842e1650ffbe42879ac7942ba2a5f9d065c0f7cb47448f7875d
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 17816 bytes
SHA-256: eeac8883f96ad1648159e142c3181a7467f2cfdfd2546a85901f9f7012ff8c1f
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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