Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e66e1df17baa9d…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 10:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2508b3f2515c56ea5642d27f06ead78d SHA-1: 14e21c7425a36c89b10a740d742e72fb7de3cd76 SHA-256: a8e66e1df17baa9d6201091fa04d0a50b296f47a3162289c6bb910e8190d166d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous links pointing to disposable domains, suggesting an attempt to obscure the final destination or distribute phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://christmaslandint.com/userfiles/jijovozepurupuvu.pdf In PDF document text
    • http://rapet.hu/files/wekonegomukelobugaxib.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wegotofirudutorikumo.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/wexalukegis.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/vajezoziwinotexafefazigu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/dapaxitutu.pdfIn PDF document text
    • http://fittbikese.hu/files/file/kasegusixobaf.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/84433632580.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/fosubufezetaxibafoxube.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/dorakepadisoposuminu.pdfIn PDF document text
    • https://t2sc.me/userfiles/18202459618.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/junok.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/zojuludegakojepemovukeri.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/mejavunejavutulamusefi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ce842914a256539606dd9aeb579425ea/39918511271.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xixisusuzuxefoxowasoseriv.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/sibebafotofifivozijuzap.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/siduzuzubemupig.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gizesu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/jawonurabomevugi.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109230626134011.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/83258228368.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/minub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rise+of+the+guardians+torrent+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_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 10864 bytes
SHA-256: e5db9759feebb1162f6078df3d978ddce02a316e5dfd3f8df6f13f2a4206bccc
font_02_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 16556 bytes
SHA-256: 0b1d9eff67e585040a0c7946188fb0cdc69ef7d7386481173a9f1be2c86fcc1f

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