Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfc4ce79d22ff80…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 08:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35a53d54b14e3a588629bd3b80bedf41 SHA-1: fdb24cb95e5fc7ce67f93aff0858e3b95acb7cd6 SHA-256: adfc4ce79d22ff80b955ec28708facb7bebdb4e4f28a0f004644ac58316ee83b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=cwm+recovery+download PDF link annotation
    • http://smenergy.kr/uploaded/file/1240499625613e33b36a881.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/96458000417.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/ranozugetaxokisirutu.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/93980722084.pdfIn PDF document text
    • https://partetesal.ir/data/file/zosakutokazokifizarima.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/8121955273.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/19277139448.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/18006219422.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xasefetemonuvug.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hq3m1n3jl98psm6akb1m0udeh3/95410835207.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/60025577439.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xadawegivaxofek.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/51316386611.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18cdc4c9b---vamitagaxexunibijafoxuza.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/1534331694.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/83117680663.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/59670540711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ececc1ba---50265845518.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/bufibezoturitefuw.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/belupuxuwusirakolunu.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/54132050740.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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 10468 bytes
SHA-256: 4e3f7466fef9b3fae1c7942e38782944c15b970ea5fdc7880b63e0d14eef942a
font_02_sfnt_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 16384 bytes
SHA-256: c9ccaa21ac7a2cedaea619ea85290377b198051ffae9aeab4bd76bfed875d4d2

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