Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9920defeb8f9de0…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 09:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41bc4715c0ef856ebfaef1a1a8fababc SHA-1: e8c8122134821d079d849697f182aebbd5f852fe SHA-256: e9920defeb8f9de0f658efc661403b88aed2e0bc277b6699a7dd2b667abc44c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, likely intended to obfuscate the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://b7b.reviewz.eu/app/webroot/files/userfiles/files/2885654518.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6c21b387---pevasopivuvijovededosir.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/nulumamusalivupuke.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/feraxupejivem.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zefuganupagarim.pdfIn PDF document text
    • https://campermagazine.tv/public/file/gatad.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/89288704141.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/79562184000.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/turutazinixotawu.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/16860047114.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/58622538721.pdfIn PDF document text
    • https://vzglavniki.net/data/file/letumemanunonumifununuf.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/sapibeniropogasuwaxadugev.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/35437435569.pdfIn PDF document text
    • http://ms01bet.net/contents/files/95296431754.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/33097417618.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/vidurizadelopowuxe.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/76730000174.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210906232211.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/11175101722.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/14024715099.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/sabevelisu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363887cf50c---penifinedemuzebex.pdfIn PDF document text
    • http://christopherdallo.com/file/kubamebameb.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/biduximikubatovosenev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=meg+beth+jo+and+amy+graphic+novel+read+online+freePDF 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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 11344 bytes
SHA-256: 9e186e3e8cb0692bf33ede1645d2dece72989edde3274e344855c22ec6f30913
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16820 bytes
SHA-256: 52fac694b359d1c2c4b40557dad71dfd52c106f825e9208c35994f57b7c2ef66