Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b75472ad96101ae…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 21:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce659e41ecb6c6b2c986af1911163e20 SHA-1: 18dd8262dcdc9dba689e7367daec2f117a5ebf85 SHA-256: 3b75472ad96101ae3a330347e26ff03ca27e75a1cfc9b17601ad9195b40fa2ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://state-lithium.com/upload/files/zokuleged.pdf In PDF document text
    • http://bpabv.nl/uploadfiles/file/92988184820.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xanovagofa.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091104002773499.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/84939738587.pdfIn PDF document text
    • https://amgaa.org/temp/files/5667384630.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130253222c06---gumamafazixuzeg.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/59322759944.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/tewajemurapomixizorijeriv.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/16318114260.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0841081c8---sumotezexepe.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109121021368029.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/kavewir.pdfIn PDF document text
    • http://halaljones.com/uploads/files/tajugipudo.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202108312258186991.pdfIn PDF document text
    • http://reylab.com/userfiles/file/niziba.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/zegakaxaxagipu.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/pezubovanobij.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lulaneneziruwi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/30569928446.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0946e11a7693873bfa65abf3b4b67722/67644187437.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/felojozijep.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/gijuwawitatafoxuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mm+news+live+malayalamPDF 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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 10208 bytes
SHA-256: d5de0df45fcd2aac3619caf2f8e745c86c62c18df33a440456ff32fee94155d0
font_02_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 17396 bytes
SHA-256: c002eb9ea68b582ab055afa5d05f29b2f58c06b650849d73b54bb47e21986f80

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