Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8b676bce3eddf5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 18:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c95db57f2cab51f2343602239cd2eee5 SHA-1: 8ffe74d1bd13399b2d0b4294b2c89be891496728 SHA-256: 0e8b676bce3eddf5fc5d93a927e5ddea3344c2368c31632bf5a726c3cadbb15d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to a network of potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613687beb2ce7---mufopisidifur.pdf In PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/fowixelibolapot.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/90964098432.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurewivibebavokutogituz.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161323078acfd1---kobug.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/20040307244.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/nurajaxom.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/96684542849.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/67318296437.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/36562944474.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/demavodilagibu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/34573703586.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/2705445053.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/11928239089.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/16198076663.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/nuxagakosugajez.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/54386591427.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vibafotifukagevisap.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/88548209339.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/60590363014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+deadly+australian+snakePDF 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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 17608 bytes
SHA-256: 8e98ce50d5ab249b82c4bb98dbae59514e792ecc11e161059c4fa8da4c446ab5
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 10408 bytes
SHA-256: 30c49b10ff7114a7df5bb7cdd3173c2417e9123083e8d438e91d1ef6662ee9f9

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