Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ad878bf9b782fb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 11:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f6daa2b97916db6d019d8cea9476e69 SHA-1: d2afbdba194c42c5d3f0320b7492a79d0a88bd41 SHA-256: d1ad878bf9b782fb6adfeabfdc488cb9ff6e932e53cf95d8ff5e7af46a2d6ebb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=mi+box+s+ps3+controller PDF link annotation
    • http://xpeedon.net/userfiles/file/20210907021010.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/33640086992.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/joralipifazaxowogebun.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73264130407.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3a361767---fifujij.pdfIn PDF document text
    • http://unseretochter.ch/images/file/61424975343.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/40846760220.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/ziwivixiw.pdfIn PDF document text
    • http://schokozentrale.de/idata/87538759849.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301bfcdb4db---76834187511.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/tenoleli.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dadebilevefapafulopinog.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/zemobomel.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/kamobelaniredufaw.pdfIn PDF document text
    • http://terrietanaka.com/library/files/29983117274.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/61294798319.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/buziliguwirujogemufubobox.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/tududibedo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lumil.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/23745781477.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/39091392423.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/mixelorotimaxo.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nalujiv.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/zelojibulazagenefa.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/kimepimogukezuzojiv.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/25042653011.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gidoxatovofozunadeb.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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 17416 bytes
SHA-256: 36d1965bfb94b11579ddeb816f1aada9247a4bd2b2ececef1a7554af1eb4a512
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 10612 bytes
SHA-256: 4d5b39c1f819a77257178dd454bb5cbadba36582816787bd1f366850cbd6c325
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1