Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb09e89362252fc…

MALICIOUS

PDF

104.2 KB Created: 2021-09-13 22:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bfc9975b45055bd23f1ac27c7330d7e SHA-1: 054b07543790545402b65e814e8d40f8e1c45ad2 SHA-256: bbb09e89362252fcef0fedbbd59f20d7af187a3e0b3cfa9f21613a5f4cdbe401
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, likely to redirect users to phishing or malware sites. While no scripts were extracted, the presence of numerous unknown URLs and the link farm characteristic point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349cb1eb550---73248101179.pdf In PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98597237458.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/51941247168.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/87247624163.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jisalurewurewipekoveduk.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/86224292358.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nukipoxowuzurolositalep.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901211002.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/suzuzefoguzupajuziri.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/31204740918.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/23027094283.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/67216370525.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/97538144952.pdfIn PDF document text
    • https://andrejc.si/files/file/78654983425.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/bumadugobuwesupifun.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132475b6695a---tujatikokopigaju.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/89822518986.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sakamekonefe.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xuwunikepewirafe.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/90175713250.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/nivebasikasumitov.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/podufoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=law+of+contract+and+specific+relief+by+avtar+singh+pdf+downloadPDF 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_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 20060 bytes
SHA-256: dba07f54154c78443328e38e0486843c12cb6b1f9d792df6f7ddb4507b0192e7
font_01_sfnt_off0001606d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17884 11264 bytes
SHA-256: 758690f07e2f26e58053ce8323666dabf6de6777067291ca4ccda61b6683a84a

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