Malicious PDF — malware analysis report

Static analysis result for SHA-256 60131f8d7c0671e8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 04:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: daa46d53869cb6700527b5954f3ffb16 SHA-1: f03c9700106159128d03f52db7a41efe37d687a8 SHA-256: 60131f8d7c0671e866d1e0d3067076209ca783369445e5a4eeb840387b74479d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://catamma.ru/uplcv?utm_term=your+unblocked+games PDF link annotation
    • http://congtyvima.com/images/Download/75324190830.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/vitogemaxozatoxutamevo.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/jotalogutunisixufi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0e808ba38---nonalibaliraxufojuzu.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nuzufetu.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/76723090125.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/40695654418.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/71916734387.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/54328186265.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/81311140062.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/4819923879.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/89792773106.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/87429102337.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/45929998329.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/94580180133.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/kexek.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909060958.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/gatufuzojev.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/sojejirogafeladuwi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9055ee5fe7f0d7c9514e62dc6d63e4ea/wuvavosenidudeguxa.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/bebezuzuwake.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/92124756167.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/wavekajig.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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10836 bytes
SHA-256: cbda283ecb12d1ed2b04e3509bb4dc620c3c5cf09174026d1a042b872a0a239a
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 17540 bytes
SHA-256: 36452c55d2497ba40218c2174e00d378117e6a092841747784546ada2a7f1fca

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