Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04ff153a94e91c1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 13:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cef445726f20cacbc24ba5ab7d7ac0e SHA-1: 1dc11c5e1a7dd515f6f0be7e2146b47faa65a670 SHA-256: f04ff153a94e91c11bc692d6c994a99ef37b4ecbb7c11ee61920c2d52c26d996
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=how+to+capture+long+screenshot+in+android PDF link annotation
    • https://iuoshili.com/upload/users/files/jixixapew.pdfIn PDF document text
    • http://tai-group.com/upload/files/88258862463.pdfIn PDF document text
    • https://kvzriu.org/images/file/jitofageverusexo.pdfIn PDF document text
    • http://teknis.it/userfiles/files/potofulemesute.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/xalasetabivupojupukoriz.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/potaxovuwubivinuvirogabaz.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/70724089660.pdfIn PDF document text
    • https://onwater.my/uploads/file/gekelamavixademije.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/xunazokibef.pdfIn PDF document text
    • http://ipceurope.com/assets/file/sixivuzomoxamogamef.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/sevogofoni.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/45182353512.pdfIn PDF document text
    • http://thaide.org/userfiles/file/79085579929.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43047564368.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/24932926812.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/577288928.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/374b4ba5606d0d2cc561168e5101dc50/73826291055.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/doselub.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56514934951.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/40449380379.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/togibamejeta.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/midakinoxigojo.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/84787237590.pdfIn PDF document text
    • http://cecev.com/stockages/files/41981566573.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e8646a7a8df8dad90a9076f51613d2ee/87564168032.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/dobopunovusikomo.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_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 15596 bytes
SHA-256: 2f1ac8a9b2fccef8ab3fb2d025186f8b779ab166f6565c4b75d79eda518cfd44
font_02_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 10968 bytes
SHA-256: 2cf31f77cd2cdbce65284545271f1100de263b4a50ae1d2a701dfee161bb429a