Malicious PDF — malware analysis report

Static analysis result for SHA-256 f238454ef4483b0a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 18:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 746f71110ac879ec5cd81841adb06d8c SHA-1: d07793eaccb8b177efc7607b33300076ab068c4c SHA-256: f238454ef4483b0aaf5632e0e829719a21f27881bff2642710bd1c0db41a650e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs pointing to disposable hosting and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chi-kara.net/Upload/files/wukiwexezejedibi.pdf In PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/pizutodonofadumi.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/32353959306.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/42435394914.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/15151433663.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56696207877.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/20783802566.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lapovigotivobipeji.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zixazarasag.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/luxexemeboxu.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/22563291152.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/saxobovamorawiwinujeni.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/81623359544.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/79698909200.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/vigodaganajizuruvufopori.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/netujoboxafunadepo.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/ritaso.pdfIn PDF document text
    • https://istanajp.net/contents/files/41123224345.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3edd0780fb83599d67e12d9431ed284d/rironidibukafa.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/48857788630.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/78176722080.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109161408077321147gdm7z.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/38483573548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+aplikasi+root+android+terbaikPDF 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_off0000befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 16208 bytes
SHA-256: 39978f114bdbffd35540070910fbd5bdee52a4501385de35cc7bcd9b221569a8
font_01_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 10704 bytes
SHA-256: 7fae468bc324036b6496daa6a4ec8e345e127e0da2004501ff83d204f0ef4733
font_02_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1