Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafabbe07b61e17b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 18:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e71b290bc02e2a20ac1f7874cba7b9a5 SHA-1: 57266f8157830e13bcb99e6ace5cc3338b318575 SHA-256: eafabbe07b61e17b2032763ca7dfd57db3476a70b9fd7d9961f713d87bbec219
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs, many hosted on disposable domains, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://inwebjor.ru/uplcv?utm_term=android+sync+calendar+with+gmail PDF link annotation
    • http://movietek.vn/hinh-anh/files/momatilorifupotomonebina.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020018245637.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nuleta.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bibuzazojowezezasiba.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/likimu.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/33744819539.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/linaberakaxagu.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/suvukagom.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/85069552751.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc40f827cc---91309492903.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/witosogeg.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/varemekepikevenosekesa.pdfIn PDF document text
    • http://e-menu.hu/editor_up/xegukaridunumigejuruwege.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wefeguf.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/75454404292.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/95594137317.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38920426266.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/69661214695.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/29811788060.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/92103754092.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6d050bc6---wurokemaxodet.pdfIn PDF document text
    • 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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 17812 bytes
SHA-256: 4dcc877ab49d992836d8a372606cb3ad40a3a3de15af06c38988470c0c0fb519
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10996 bytes
SHA-256: 274dda0ea064029dfaf337c7d34148671d559a3602d0121bb1ccdece1a7d7560
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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