Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9b2c0e2c9a53dd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 19:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c64b070ac7cd1c7f1b186246059db0a SHA-1: 128f4fd0a2d5fa8dbb7e3fb1e723be433e1d3eb4 SHA-256: 8b9b2c0e2c9a53dd8b472405b9ad339489892a47a6a8e4cd813b03e3eb947e95
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used for phishing or to redirect users to malicious sites. The PDF is also flagged as a link farm on disposable hosting, further supporting a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=watch+latest+bollywood+movies+online+free+on+mobile PDF link annotation
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12794044889.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/funasunodefijezuxeguliton.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/38492125392.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/37063287651.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/relalozubum.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/fepiwazekem.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/desigebozotawowupugas.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/namuperagibitodose.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/91453679543.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/logef.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wemabotufokutitepug.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/80227595125.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/66476417495.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/82499938323.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614017f60d722---safonevimozopekodusoduku.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/zukejixogavilora.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xuwelenovas.pdfIn PDF document text
    • http://origo.ws/userfiles/file/kewoxipaxezuxedojaronajo.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/sofezawik.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/3443334018.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/10444980907.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/difebetimawekapogifufub.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-14/20210914180655966986.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/18671087711.pdfIn PDF document text
    • http://kaies.net/upfiles/file/29912848966.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131bad6b53c4---jipuzisipo.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_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 17464 bytes
SHA-256: 4fd410e61d960dbe4ed3956c40cf344941d10a6a7a6d160c3636dfe50f3887fa
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 11140 bytes
SHA-256: 58344e553610c8dc49e5e51338c04387b47982b8c3b317ba800594608862c595
font_02_sfnt_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1