Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ae3846afe5a60e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 16:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4472f748494344e8eca23fcbfc7107f SHA-1: 58035bf649485a1178f256b99bb1d9f4d509f7fd SHA-256: 42ae3846afe5a60e921085fcfe29641f003f02836a26e9a87c53820d91a16115
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high concentration of links pointing to disposable domains, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic firing confirms this behavior. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to manipulate search engine rankings or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vietrocknet.org/app/webroot/img/files/kawuwuzekijir.pdf In PDF document text
    • http://mevlanaasm.com/resimler/files/73028840727.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/83820219007.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/78114049281.pdfIn PDF document text
    • https://bunianco.com/other_files/File/1966679829.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tekoloz.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/46783928001.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/26446161688.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210908122709.pdfIn PDF document text
    • https://digireg.pl/upload/gowexekumuwirowavi.pdfIn PDF document text
    • http://retailcop.ca/files/dujemapetexor.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0b1ba2db---52257232692.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topokageva.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/woxinopajaket.pdfIn PDF document text
    • https://gornjastubica.hr/files/tiputazomuliruwupesavopu.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/48805525314.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/7385168998.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/65822855409.pdfIn PDF document text
    • https://electroagro.es/pub/files/zifafag.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/46278698556.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/36240205332.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/79135607180.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/visojifenag.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/munesedolixosutedaxutogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+ultra+sun+and+ultra+moon+apk+downloadPDF 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_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 17324 bytes
SHA-256: 0597d65e4945cf822274bab00677b1970a744ffc8be9e44364888371cebf32c3
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10740 bytes
SHA-256: 91746139cf2081d495418f1d9ee7054982ec96846587190d0b66855c03d5a0c2
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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