Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0f0684c65bd477…

MALICIOUS

PDF

156.4 KB Created: 2021-09-14 03:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e01a6b8e8ddd4636adca4417e1064a12 SHA-1: 613dc77ed047cd70f20b16f9d362e4cbde822d3e SHA-256: 2b0f0684c65bd4774842ccc4bd35bffd3e32f09567e926d2386c77f072c9289b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to obscure the true malicious intent through a large number of low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://lehnerkom.de/images/uploaded/file/44877608297.pdf In PDF document text
    • https://sankaibearing.com/userfiles/files/rawivimodepajosipibavela.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/1512769199.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/mijuxawetudoler.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/49235524162.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/85363504410.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/worazakolojunixiki.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/21047508094.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/97953645472.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/80900111712.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/nasadidosenodub.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/tejituta.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/japitijorinelijoridoledo.pdfIn PDF document text
    • http://ccshecea.org/upload/files/69507844249.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/26883629403.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/73181400027.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/29432116034.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/dc2d38abed3ea29673ed34d6ba845d7e/5871379091.pdfIn PDF document text
    • https://777mto.org/contents/files/vutiwirusi.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/ximowikokufigipo.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/lagadekid.pdfIn PDF document text
    • https://yuktogel.com/contents/files/7142482334.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/041342075413.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f73869262f600994d854975ad8156c24/bixeposodiwutakujobase.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/gipofibomelaguxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lord+of+the+rings+first+book+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_off0001fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA98 10756 bytes
SHA-256: 550c4b9282d85f65667786648a094d34a930e7d681ea9b98ebc04baf0e4753d6
font_01_sfnt_off000212cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22ADE 21272 bytes
SHA-256: 6fd56d5805db3f1c5a5c7e56ba629bf2fc8ca9b408eac18ab1b81a22ab1ce4fc