Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31313b37943ca25…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 06:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af4dd71e0e51d58a83a2a29a5be705db SHA-1: f48a1929acaa62c8d940b7304a3fdb01ec209d97 SHA-256: f31313b37943ca25964edd9d5bd611f1da55ab1780ed4e3f1a513cd9a1ce5d89
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of many URLs suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://aczv.fr/userfiles/file/jufiwitudir.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135088586781---91687162047.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/88705971199.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea71890cb9---vusinaniriwimalafu.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109040514345916.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/55189047708.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/74602105441.pdfIn PDF document text
    • https://bloomeng.com/uploads/64478860118.pdfIn PDF document text
    • http://vitrine-prof.com/files/numolu.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/85357392520.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/4191073776.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/49655101088.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/jerutuwugunifajejezozo.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/20615544170.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sibudufigobopijiziralisul.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/jekisopefekafupaxa.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/fulosujumawewobu.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/vinawibezut.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/75734276732.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/26490859967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=zerafa+vs+mundinePDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 17764 bytes
SHA-256: ee2c3500c145d42467cb272564c8ffd3f7cec7a469fbfe006ff9b80f5593a22d
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 10380 bytes
SHA-256: b536278e20653b84cbd835d6609fc91a07454841a2781be62427cfd32fd3e49b
font_02_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.