Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d1e6f253b26f90…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 16:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7a4cc93f67d7c327cb80bcf0c77f554 SHA-1: c3ec1bec0adfa0167fed67c4ae7862a05686a150 SHA-256: a3d1e6f253b26f903ba2a3c87be5137bfb43253193c347a361e0a0c916eaede5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=bigcraft+new+crafting+game+free+download PDF link annotation
    • https://stpm-sa.com/userfiles/file/pofidamuroguzirozupiru.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/65436480368.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/tevigisimewimiduwebexulu.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rewixirojuvufagopuseto.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gifuwifafuwojugisitafuwad.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/nakejatesozilufowigob.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/70249297080.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161328b1ff337c---38318167719.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/37516583369.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/wusivigoxore.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/893139973.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/97129681046.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/xupijadefogo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ef5edced---balaxanimofipigixinadovos.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tinuworidaxowuwepe.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pemewiketuvesiwafulapogig.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/6905346245.pdfIn PDF document text
    • http://nemochem.cn/upload/files/47674700269.pdfIn PDF document text
    • http://arsvet.ru/img/upload/vupebise.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/kekefebitetikekazake.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/57461605224.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/jebokuvopomisilosaxurapoj.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/89107092794.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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16504 bytes
SHA-256: 71eae915e736985fb6cdaf3f3d95980a6910e8ffef9209755d5da0dcdb3c0cf4
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 10788 bytes
SHA-256: ed09434fb0fc5c4fa9ef02ce3118117f26138f7bd94aafc9d24ab71b57d8dfe3

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