Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fd3fd905fe6080…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 00:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1485f91b44ae0fb0391e2f5a2b283e3 SHA-1: bc060de59aff8144098b3b1d7c5d280cb8b0e6f5 SHA-256: a3fd3fd905fe6080da092622a219957737c03e5525333d548ec29e5817491bb0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links per host, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dison.cn/filespath/files/20210909235457.pdf In PDF document text
    • http://touchpanelpro.com/upload/files/63323184847.pdfIn PDF document text
    • http://aven.su/userfiles/file/25191083338.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/44713208969.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139aee1b745d---60035741836.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/kogojisir.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/78898971706.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/3327360742.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/kolutiguz.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/17095361723.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rimapoginano.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/20219693981.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/72848141714.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/dekefe.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/gemujexezamepawemiwezos.pdfIn PDF document text
    • http://weldingplaza.com/files/file/wolaxun.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/sufikupebovumegiwe.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906201304887075.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ks2m2okvrtaq84457j4m0dg2a1/89071781084.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rejixanidesusiv.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/pitekemupokixuxinad.pdfIn PDF document text
    • https://triosms.com/userfiles/file/16699422855.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fuwukabuvanitexebazew.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/87135378291.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/75875200684.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/toxutabifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=50+shades+of+grey+download+epubPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 11188 bytes
SHA-256: 1563a4b379a8a027b13122e8b96f2188d4b36b57062b3f4f5f3384688f1526c2
font_01_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 17956 bytes
SHA-256: cb64ef58ead760fe574d7505a76b33316090888665c7b516380df7e745e4260c
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1