Malicious PDF — malware analysis report

Static analysis result for SHA-256 e309034a2b76b9b1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 12:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20ff82ead239d04d7cdbd3331d27b60d SHA-1: 2f0558be89ef8a2d372e068b163fcd7f1f9a52b7 SHA-256: e309034a2b76b9b14c8195a5b13006406c14d2bd6b61052a53deb1d3ccf46320
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to a network of sites, likely for malicious purposes such as phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=pokemon+platinum+nature+cheat PDF link annotation
    • http://ayrh.internet-match.com/upload/files/dijidowixu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/budedileduxiposago.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/64362130424.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rakanadewulu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/71438954726.pdfIn PDF document text
    • https://profesa.net/userFilesfile/banejipuxutapobowatoduti.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/57998048044.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210913_070454.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/34430361812.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/vunaxuloruli.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/10622920505.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1veurrlen9qgdju64pmfte2gdo/lajevumisikokiladafamuvon.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/pesifuvej.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/92861745628.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/29720389237.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/42824575892.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/kezizetujekasewewa.pdfIn PDF document text
    • https://people11people.gr/uploads/File/sijorojopud.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/sejovidapi.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lomezapijawa.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/39835880332.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/kijuvisafifa.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/85787430283.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/6722786825.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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 18424 bytes
SHA-256: 753783c82bd20e6aea864f722250860188b744ccaf1aedc6586483f9540cfc56
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 10664 bytes
SHA-256: a927d59e8ebc60f507c53a92f33b3352d3c958fe3b76a914bfd3a96d287804f5

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