Malicious PDF — malware analysis report

Static analysis result for SHA-256 e249a84fbce15750…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 04:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb96b60028c6141ecea519ad00eede7c SHA-1: 907818a677bef5b9f33e77671925bc39f409357d SHA-256: e249a84fbce1575069d9d8fe7ecf20d2ecb61f36d76ad7667feef97fe8283db1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links, many pointing to disposable or unknown domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing attacks. No scripts were extracted, but the structure and numerous external links are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://www.antoniopopolizio.it/ckfinder/userfiles/files/62453842171.pdf In PDF document text
    • https://bruceautoservice.com/files/file/48185012413.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/mopajes.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/37372339885.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sifajofigimizeberem.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vuwikisogogogam.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/44543089758.pdfIn PDF document text
    • http://cecev.com/stockages/files/50705216613.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109101238332205.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/nisaxe.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/gababinok.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/mewefasiv.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2b6c17e29f148ed4c4383dfb2d3c7e5f/zokonu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/devuduwetijidozuzo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29c9b3045---52184839959.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/40100051903.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/nakepefim.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/futefivijodiwaliwafuni.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/19587971074.pdfIn PDF document text
    • https://remini.hu/userfiles/file/57783252247.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/87875737789.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wawagemedo.pdfIn PDF document text
    • https://yodobashi-church.com/13179131001.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+system+ui+in+mobile+phonePDF 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 17420 bytes
SHA-256: 6ea30b64a7a52fdc8c8a0c9cae7ae4ab7296f4a25d1fe856f860865649955f23
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 10764 bytes
SHA-256: cdda4dff2cfacd7c09ad7affc995bedf24e51a62a253801f6c9c7928893b8b99

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