Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1663e6f1965b3b2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 04:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ff6677b3ffb4620c9d441db626f4b41 SHA-1: 656146e9cd23dae12b253ed37dc489b49082e887 SHA-256: e1663e6f1965b3b24eb6f5de9a67cc8c55f1e4825bc9f8b8addf006c27d7e029
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDFs hosted on potentially disposable domains, indicating a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. The primary purpose appears to be directing users to a network of malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ramenhajimetustin.com/uploads/files/3612281374.pdf In PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/sojipi.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gepowuva.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109060907354878.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/satenabigikaxufosu.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/dazuvebumuwij.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4a2f6abe4f03e39f4b646f536c85656e/94687168815.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/9210516328.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/65402335461.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/25902195016.pdfIn PDF document text
    • https://norservis.info/files/files/vefogesufu.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/sofaxo.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/73715092718.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161408845f41af---mupasuzunibuful.pdfIn PDF document text
    • https://alohasafaris.com/files/lonerupixuxoguxebixad.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/pupipopesenisudise.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/71076489240.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/12264107045.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/74391088996.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/36791912870.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/54179309606.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109140134087346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+delete+data+from+internal+storagePDF link annotation
    • https://b2cdemo.tickets.com/content/files/74323811002.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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 10772 bytes
SHA-256: e186435959360933dfd983db9a45ec724bc8614d9f3bd9f54ff69172871887f8
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 19076 bytes
SHA-256: 114a818b47b79daf22d0a2705ab411c48ecb92829472129864009855a871dacc
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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