Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9cf51091feff98…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 12:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04f3aa6f6b8b6f06c327039605fa2d2c SHA-1: 2bba8d6c0f8e0c2d72a65b47b97d6afbdd8f7785 SHA-256: da9cf51091feff98f82a9fcedf9fcdd0641fe4ed6fff28982fc191c01ffcd5ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The `wkhtmltopdf` authoring application indicates it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=datepicker+month+only
    • https://otoform.com/upload/ckfinder/files/27599897026.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210915_6914CED74130CDB0.pdf
    • https://harrisitalia.it/uploads/file/moxewumomarixu.pdf
    • http://pc75.net/upfiles/file/1631437838.pdf
    • https://satellietgroep.nl/userfiles/files/5938040954.pdf
    • http://quaretti.it/userfiles/files/gakasomiboder.pdf
    • http://abarappresentanze.it/userfiles/files/dozibokezunidosovot.pdf
    • http://ominocoibaffi.it/userfiles/files/vekerekinuvamodazob.pdf
    • https://profesa.net/userFilesfile/vukedamenogamovidigomew.pdf
    • https://petribax.nl/userfiles/file/fekurema.pdf
    • http://theclelandgroup.com/img/upload/file/kititogusedukeraluk.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wubad.pdf
    • http://yasairamenbar.com/uploads/files/45645579345.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425405e10b8---fobaruxurefegolurubofepi.pdf
    • http://igigeothermal.jp/userfiles/file/23897041343.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/45516481027.pdf
    • https://thebillionbottom.com/business_school/uploads/file/valomaziputeba.pdf
    • https://giaphutelecom.com/tctt/sites/aaa/file/64702943932.pdf
    • http://akvari-um.ru/userfiles/file/dovot.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210914_F88F076479479DF2.pdf
    • http://delfosventures.net/userfiles/files/71393270387.pdf
    • https://crbz.ru/userfiles/file/piluwurevibigotibas.pdf
    • http://machulski.com/public/file/feluxopimipofuj.pdf
    • http://bdnchem.com/upload/files/gutonifuxidapawiga.pdf
    • http://centroolosprato.it/userfiles/files/17223026259.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/kebutije.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e873.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16792 bytes
font_01_sfnt_off0001008a.bin
b1ef53a89743aa9f4573bd53a03cf5489990e955bb7494722188c2e98484a684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10676 bytes
font_02_sfnt_off000118cf.bin
8af995eb39a0f17fba723625b44e367df06f8a7b41a8ace610096507a52168dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 17592 bytes

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