Malicious PDF — malware analysis report

Static analysis result for SHA-256 d886f2919ab8c4db…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 07:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f84cb3f68c559b7a25e3edffd57b92b SHA-1: ec625d76a0ca0ef5328312112159edcab3b46d70 SHA-256: d886f2919ab8c4db0768a0fc6ef1982d61db1eab29ecec692d23d4b77e53e7f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly imply an attack pattern involving redirection for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://izr.fr/files/xepazatimamafid.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/kugakevojel.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/60892133170.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613556f3481e5---vavixanumuruzogugu.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gividejarewaporivi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/16016740710.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/69032000108.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161303f20b635f---46845390426.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/36307007308.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jakufojebenotokozanuko.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/52276073669.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/25984427923.pdfIn PDF document text
    • http://bienbao.org/uploads/files/29983786344.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/251779007.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac4c23696---wumubisodijudafexob.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/17948220074.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/xerijowarexuxa.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kowesopitoxovudoreru.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://noithatlekhanh.com/Images_upload/files/64743441369.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/tozifovifimuxemepaleja.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/55815153624.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gudatizisebebaboz.pdfIn PDF document text
    • http://lejuriste.ru/files/file/menukawakefekapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=life+of+pi+test+questions+and+answers+pdfPDF 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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 19148 bytes
SHA-256: 3c70ece1c97f81941196de1ccc966b84919fd242234b05b9cba2f84e795bd870
font_02_sfnt_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 10732 bytes
SHA-256: 8c16d4cd75d0302fc15a8d8e17ae7e3dc1cd08d077c6973b27f4eb4fa0d12ab9