Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0867defde12c297…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 22:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85e7ac72f21e4be096066b5cfcebd98f SHA-1: 407d77de25f27f99dc327bb6644e34e73a094312 SHA-256: f0867defde12c297e69a3bf0cbdb6e54a8cfdb09b24fb6c08329ea20d3c84d6f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high number of external URIs, many of which are on unknown or suspicious domains, suggests a link farm or redirection mechanism intended to lead users to malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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 http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/lorejesu.pdf In PDF document text
    • http://vilocom.net/webroot/img/files/sebumokunu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f02ed16b5---magugoralasitosiwikimib.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/vizozu.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/54342471748.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/dofojesosisagijemitaxi.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/bazuzusevunitawutez.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/73034316837.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fefikuvinadowu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dowateruzumur.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/83234920227.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/keruxubejewudugeb.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pidofuvu.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/85252508082.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/dadopokusaruxefefulizef.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/rimupebodusilufizu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/88626214017.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109020209365633.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210912033100_MTE3Mjg2NzUyOTE=.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/virotokokuvanixizizajidid.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/fomoramefoxixakolu.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/wivezipunar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+transfer+files+from+iphone+to+pc+with+bluetoothPDF 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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 11064 bytes
SHA-256: b28a775a7553d2a04497787cbcd19f8a030455948d41f1f136611bea6efe9060
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 18432 bytes
SHA-256: 2a2d270c7d0bdae94adf0edb1411995c7a33bb558be119d1c1bf66c6926d5a32

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