Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b22a04855855fca…

MALICIOUS

PDF

90.0 KB Created: 2021-09-13 21:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eed14c01ecce5bbc85bd4ee0f52200e0 SHA-1: fec48035609f3a0ea8c597b3273b710d59ac6d0b SHA-256: 5b22a04855855fca22eab15595199b402f5afd8d0bad2fad1059dfe7dcb19987
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://tahubunting1.com/contents/files/kekitoped.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e0e8d16e---36882894440.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/78951373158.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210903200501.pdfIn PDF document text
    • http://domario.ru/userfiles/file/63439427107.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f9d6e7ee---kubegubigades.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210912135546.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/pivutufijinale.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/44112770773.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/rekorusukawuvuwudavol.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/vutujalugum.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/dewokojutikumelapowek.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kujunonip.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mabusagusoropawit.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/37678456282.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/vaxetegizi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/54233585727.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/milabuzenekegisasere.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/dapimemewerolofo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/71762420668.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/88001170466.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/joxilelar.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/91655180477.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/soretudixijopixumox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fast+times+at+ridgemont+high+full+movie+watch+onlinePDF 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_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 11152 bytes
SHA-256: cf04a14d3e4f2359b704fb5f26e6c29d496d6bcb6b6050822f58d4dbd0c0e19d
font_01_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 17596 bytes
SHA-256: a059019ab4ebe163b1a2327ce0d86c163f9d2e6a1536803f89c2066b527955e8
font_02_sfnt_off000141b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1