Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ee5fbd9c6dbbf5…

MALICIOUS

PDF

72.1 KB Created: 2021-10-10 10:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88a1da5fc5b7d6435c8eb175906642a3 SHA-1: 8868f0a6f85d3fdeb55fec1c3d46ad392fcaa4fd SHA-256: 94ee5fbd9c6dbbf555a5c3062002a74f5189ec789748d30287551ab499789501
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to host a collection of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://lulanjina.net/upload/files/renutebimezemim.pdf
    • http://teamtrinity.net/trinitya/file/tixivofenokemig.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/16606164349.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/6997269146.pdf
    • http://sipsak.nl/userfiles/file/pipeginog.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/46613857163.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/53298733552.pdf
    • http://baracenter.be/userfiles/file/zujabukutajulaleful.pdf
    • http://www.depomatrial.com/file/ribojodupuxunigolu.pdf
    • http://miydz.com/mingyi/images/userfiles/file/8550240260.pdf
    • http://c-amc.com/upload/files/68520567511.pdf
    • http://madang.eu/f_pds/fck/file/mumegosovaz.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7f1b73a1d---legowo.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/7706452725.pdf
    • https://desarrollostecnologicos.condotiero.com/imagenes/imgeditor/file/45349924642.pdf
    • http://signfabapp.com/ckfinder/userfiles/files/48362639066.pdf
    • http://2m-m.eu/userfiles/files/juwemu.pdf
    • https://keongracun.org/contents/files/faripugofekafumisuzi.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/87971143238.pdf
    • https://penal-garazh.ru/files/6120634943.pdf
    • https://keluargamimpi.com/contents/files/wanegogobazikaton.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1543c573---22218660147.pdf
    • http://aaykpn.com/uploads/editor/files/venakawepogiwa.pdf
    • https://sofupingame.net/calisma2/files/uploads/40108696309.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kode+voucher+lord+mobile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba4a.bin
49fa799962bc2250d4a9632f659db5b5d55bbf2e7c2a58e00071b67b32a4d834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4A 15892 bytes
font_01_sfnt_off0000e30e.bin
fafb3b5768e3e2a0e21ff6ccda8a685a8d98d5e56c93ce890f3884676d913129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 10400 bytes
font_02_sfnt_off0000fa7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 16792 bytes

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