Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2b7f5d93ca45a6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 06:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9538c9e73fe53ac9b47bbe97be38a807 SHA-1: 14bf36c893ff65240517248269a635a040f3fb13 SHA-256: 7f2b7f5d93ca45a60cfcc5eb21a6dfbb766db11aec677472c8dbf6fc683ef048
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL distribution suggest an attempt to redirect users to malicious content, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hndgyl.com/v15/Upload/file/20219101834329602.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/40662539134.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gudatizisebebaboz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf715351d1---pizupenilaguxesixi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zokadi.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/58196333168.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/famogimapesetulonij.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/38458091601.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/babakupatasomawofut.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17240835396.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/lupoju.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/libewoposokojupupoda.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/76073134471.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/suvatibi.pdfIn PDF document text
    • http://trubaopt.ru/content/file/tekokalujelemirowumunidij.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210902131949_1133106877.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/nokarusisenade.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/68518526133.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/21091358158.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/2112111238.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/9092754691.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/91883310436.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/926ce449280d6dc6b7612f3d1f339453/75469770162.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/94350985830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ipsec+client+androidPDF 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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 16152 bytes
SHA-256: c5b00f512fd1772a134b2726117b2961f0e96b77d62ed9045048ee18e9092745
font_01_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 10456 bytes
SHA-256: 40ac3ddc1151cb4395bc662ea8b661c281792f40ba4fb6261a8a50cab74a5e42

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