Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbccc2b629cecedd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 07:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3c61c861f044a967858d69bc72f96a02 SHA-1: 6eaa05b1fdd7cb39f73f42a0df28097c6afe0e01 SHA-256: fbccc2b629cecedd1cd7a854cbe1fd3b28c158287606ab28b488b3daa4a9ce3e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs pointing to potentially malicious domains and an IP address, suggesting it's designed to redirect users to phishing or malware hosting sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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=time+killing+games+android PDF link annotation
    • https://henseltech.cz/userfiles/file/kipekiwigisimano.pdfIn PDF document text
    • http://ruihuitax.com/files/file/9835131398.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/48551439890.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/dedebagafisasevan.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/borurimidoxibojojika.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/45482637066.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/39706204692.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/21756088057.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/seweziwetusagakoxaxolep.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/83076472650.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fc5594d0f---satexuwadewubobi.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/ragujalatolutevipaj.pdfPDF link annotation
    • https://techlan.pl/files/file/82904807048.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/sukojeb.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/11947362209.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/30640572123.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/55270562293.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xatifujuro.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gotaxoviliwawasekek.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/fufireduki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6ff158f---10494591207.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/pokimu.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vagigaluzuratomusabux.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/80268403297.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_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 16684 bytes
SHA-256: 7210484b7edbe2eeb802c9707b99bf0d9d626a0d7ddebae32a095acb141c882f
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10548 bytes
SHA-256: e857e32f254a14e648d4af61049f4b3e6b4d964196f1b81cfabec5e0686df740
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1