Malicious PDF — malware analysis report

Static analysis result for SHA-256 4059fe1ec57d2470…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 04:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3907c8340361d6231bbbb40abd282ba1 SHA-1: c3444dfc8114d9cb878511fc5f0dbd42ac848e14 SHA-256: 4059fe1ec57d2470287b7bdd20ea3eee0f7bdb8e39b973b16f43fda59d39a924
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://munis-roquesalbes.cat/demo/vilalba/imatges/file/vopebuvezitor.pdf In PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/42265749841.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/80161023900.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/71845736596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a9fe2bd8---kisusabu.pdfIn PDF document text
    • http://agavietnam.com/img/files/lodasofekejotiwakegev.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xupiwutunujimil.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/jixili.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/fazuvexifa.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/11932769139.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/pebetotarudewewoxetepa.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210904180210.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jabizuxekesazes.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/povob.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/41738851616.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/22060406922.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/lareniwedozaxilineri.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/82464717304.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/98543357233.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42172247991.pdfIn PDF document text
    • https://betsin.org/userfiles/files/pazakuxadixiwa.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/suvemovutisos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=miraculous+new+york+full+movie+onlinePDF 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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 10848 bytes
SHA-256: 4e7f092b6844f091d6f4a3b3905b6ae109f39aeb8b2b909ab37578cc035ae4f8
font_01_sfnt_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 15300 bytes
SHA-256: 70c22b7ce7684ddcbdf3ce3b8de605c0480a9ea4878598c5809329bd4d03f75e
font_02_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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