Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb5bd905a2503dc…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 21:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e1dc9212224f1c0f2eade475f543278 SHA-1: 188147e4137598fb85e973e1ccd3b406e1c92783 SHA-256: 9bb5bd905a2503dc4dd1ab9e75c621509ffa45f945e25231edb3e583b5b5b247
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The PDF's structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://nomylo.ru/uplcv?utm_term=subscapularis+strengthening+pdf PDF link annotation
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lomezapijawa.pdfIn PDF document text
    • https://maisonforville.be/documents/file/nosedexe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb273410c7---falekibajuzuriwinageket.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/55108165877.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/37586668114.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/69586379826.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303a3622ac3---fopekavixodomame.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/venifixubulepawituzadawu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/29163802969.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/lejizesilukegesizisiv.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/64583162659.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/52106406965.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd43ba327---doxodovusabiguwuloroni.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sapiveseg.pdfIn PDF document text
    • http://test-immo.com/file/17868655039.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/90263582659.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/pepuvepagu.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/fuzofogikevenewuso.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/6766074044.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bogeluvozojibexibatafegin.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/89643446842.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gaxaralijiriripakupida.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_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 11092 bytes
SHA-256: 3b15fe5471c82b73f44bcd773e7d63fe0881882f5e5d06d421694dc05e242174
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 17832 bytes
SHA-256: d0591524051e5d7a566c311ea6dd75164b37e9067b85c22e35395b1391e542a9

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