Malicious PDF — malware analysis report

Static analysis result for SHA-256 308136c8a0f884f6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 09:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e48333cb1f89338eb8ffe1136cb30424 SHA-1: 1994d60f8940fdafafec32bba438e27a543088ee SHA-256: 308136c8a0f884f65c68bdfafe15bde6dfd4535342a3bec23780d76ca4654db2
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. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of numerous external URIs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://natpuedu.in/userfiles/file/27843779186.pdf In PDF document text
    • http://helenhotel.vn/upload/files/34034059753.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wuzifojatudezawaxev.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/67554769763.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/bumiwabisufotasufusi.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/rudilidakovup.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090713151479.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/58144827800.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/zajiguto.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136f22c03af8---99963402919.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/jepududateferaxakejigi.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/durutamadamamovun.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xijev.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/22313245647.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/notivadapadiwurukawavozo.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/sorajatuzajelatejaw.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/kukowalafadazakiwolo.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/30680069284.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94962356362.pdfIn PDF document text
    • http://keacg.com/upload/files/pekoxakigumagejutexewilo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d305a8831---duronuwigem.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kimidupobuvazasujanigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+lock+pdf+to+unlock+pdfPDF 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_off0000b8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DD 16272 bytes
SHA-256: 2db9ef569cc5a497fef0d76a8f61ad829106e856b255d6a379073fa2cdecfa58
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 10480 bytes
SHA-256: 321dcbbb8810b2577c802022f2cdd4c39e183b561b09afbf723d5e8971ce6751

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