Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7d0fe7d566121b…

MALICIOUS

PDF

93.0 KB Created: 2021-09-17 07:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a47dbaac4094e4ed8fc976f1bd85f8c SHA-1: 35d25de802c0281213846e2906ba077324b02a8e SHA-256: ac7d0fe7d566121bfbed7a4455cc2c5def94deac595b6d7733b31bdf2dedc1e5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful content, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=watchmen+comic+book+pdf PDF link annotation
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/sunoredunexutitobugifeduz.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a509c5cdd8---30809558483.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/fojunufojazomitirarajerip.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/nakujugiwusim.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/zaxako.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/49818299005.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/vatinukitemavorapurokeneb.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/wuxelada.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/63345388004.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc99245061---57266585239.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210917_DAECC94447F9E879.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gofowanufimu.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/55902555229.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/90805871329.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/kabapu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/99246282051.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/11436437962.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021091622480173499.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/xoxobuzobabaxozarupudo.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/fagepoxemes.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/roxudurevumusigimi.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwomekagiguwapexuzawoba.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/nojobeniva.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/wikig.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/12390660613.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_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10796 bytes
SHA-256: f0ac4314497be38292167757ea9d2e333048f24b749cccdb76d09132a9a57d3b
font_01_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 18056 bytes
SHA-256: ddae468aef0cbb1ed1811a440213ecdcf5dd4ebe1f92bfcd7612975395d56242
font_02_sfnt_off00014dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1