Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c9f96efc16fe1c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 09:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6a6dfec822333e87bae80db7a1f9b08 SHA-1: 92c4986cafcc5b4768933e3b1952d0283f3642c1 SHA-256: 66c9f96efc16fe1cd3dc828714b76b1741b1a5e811238e53c4907298eaa8cc17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=android+file+converter PDF link annotation
    • http://katyababash.com/images/uploads/file/zijivakazepavuzugokewid.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bcf72138---fegagekubonigomuvagerelo.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/17976356062.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/nobutolafoboxibus.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/4588886696.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/2505119366.pdfIn PDF document text
    • https://melz-feu.ru/upload/xadasasowunefurotafijir.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/rapokepirafagekil.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/2625799868.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupujo.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/46233241874.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/kisekuvugomagula.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/37619201016.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/telimupubuxazufuta.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2e17d9296d8400d6ed5e62a4506cc92a/lubuvagalenibomulibazevef.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/63660887674.pdfIn PDF document text
    • http://metall-press.ru/files/donurewixalisogefipuji.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109011237418713.pdfIn PDF document text
    • http://akademibt.com/resimler/files/24708429954.pdfIn PDF document text
    • http://archbot.pl/files/file/6901253402.pdfIn PDF document text
    • http://etkenkalip.com/files/vebibenobevel.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/ruxerapiliponoruvu.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tagisaripod.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091009450973499.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/12390660613.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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 18512 bytes
SHA-256: bde086d05ab325719f2924835bec4716193778f09619eda94a80ed490ab57bcd
font_01_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 10188 bytes
SHA-256: 891c4ddca57bcd9cf79b01a709cff86180d55d788ee0bfcbe965990fae5afe61