Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b41f44d1283e230…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 10:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 021e221ffe4bc060ee3f12dac2cb8e1b SHA-1: 6c3a9f8c18826e909fdab3a5b955665bb0a2f419 SHA-256: 7b41f44d1283e230cd0bda2c559d243cbcaeaeccb2b2c964b41caeb4d5f1c29e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to act as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=the+maze+runner+full+book+online PDF link annotation
    • http://brilliantsolarpaneling.com/userfiles/file/lofipo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ec4231b8---bipofukogigejugidape.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145390542975---3498737191.pdfIn PDF document text
    • http://rotang.net/userfiles/file/82443169891.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/25758067621.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/lijeri.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210903083256505.pdfIn PDF document text
    • https://fq.ua/images/file/92151107507.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/zilomunixifi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/duwigirabafi.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/tolomifinuwurux.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/8914168545.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/93222981805.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/ziwap.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/xexegimogox.pdfIn PDF document text
    • http://belv.ru/userfiles/file/tiniveratulovuko.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/gosaputapivolorof.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/riwofilajafesorip.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/petovefisovojosug.pdfIn PDF document text
    • http://awards.nl/img/cms/file/36669808757.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/magemegek.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/jivusizubaj.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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 10568 bytes
SHA-256: 12aa1f5ebcbb963fd39c838eecd103a58cad4b75eeca8dd4c8dbbce01b57433c
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 17656 bytes
SHA-256: 8cbd5e6e18f131a19e656dc1556486594e78b7ce16f7031f7492b2bef5661b62
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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