Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02b787ed7e2c561…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 15:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84198b9a737dff29470e074030ccc154 SHA-1: 912931ede8a3036b6a013ff2788ac8c52b264baa SHA-256: a02b787ed7e2c561414b92a5fc0706ea1b5001a95ad38400e6bf2197d9c315f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://henskeschildersbedrijf.nl/upload/wapilategafuj.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/1897735968.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/robudimiduvawufaw.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/79537994411.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/34269748528.pdfIn PDF document text
    • http://email-database.info/userfiles/file/1832418091.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/26765264345.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/velezujugipadifopelebo.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/23749914280.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dugalexexa.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/84432991164.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/xugug.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7salufi1sk7g46n96ifhrik308/35104050592.pdfIn PDF document text
    • https://nexapos.com/upload/files/69801366313.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/43475688784.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/dilej.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/rolefabibapinelumonaxoj.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/bodami.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/genimisapajup.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63171659482.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/wofupenunebubi.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/1297794023.pdfIn PDF document text
    • http://apsons.eu/files/file/44884406350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shadow+fight+unlimited+everythingPDF 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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 11076 bytes
SHA-256: 6fcbcbdf209621e7f506122a6dda77a394aff68bcf88fba58458f18d32d9da83
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 18528 bytes
SHA-256: e6c33e372ae6eae8cedf3ab446327047433d7964ab5e0dcd0c74eb15a7484d66
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1