Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c6394b67a356ce…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 09:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a314c95077f6abfd9784268a0ff80c7 SHA-1: fd930c2f03331db1ed92362d7a0bb9f735f651cb SHA-256: 98c6394b67a356ce0df4ed3f8c33d358823d40b872dfc115b1f9544c9d0895cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=episode+game+mod+apk+unlimited+gems PDF link annotation
    • http://zubrcup.by/files/files/lopedefikogexeduso.pdfIn PDF document text
    • https://iohrp.org/f_files/files/fanazorojewijoxox.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bilunamizonof.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/88897718459.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/74556637235.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fowidijowevusasuma.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/59122841712.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109070945062918.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5cef2fbf1---nefifoje.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/zuzufujivinegafogu.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/75878382202.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/87517206712.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/91458502930.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902110255_bm9qb2thZ2F6b3ZvZG9sZXRhcGVmdWdh.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/87827177376.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/15066373153.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/belasuzifoxuwozapuwiriz.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/movuvawijeso.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/1517962219.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7f153d79---74027090866.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevafirugabepu.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zexudar.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/84288578142.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/falikamif.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 19384 bytes
SHA-256: b88327dc09493f634e16d5a169486b30591dac8586adfaa18440c74085f47483
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10808 bytes
SHA-256: b540e62598b8e002b49e50e1dd87cc9e455684dd71080a2985da8a635e24e57a
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1