Malicious PDF — malware analysis report

Static analysis result for SHA-256 031cdfb3bdcf535b…

MALICIOUS

PDF

61.7 KB Created: 2021-09-26 00:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a7d104f7c82d5505702377a29b8db22 SHA-1: f491c729e7541de738d4e63a9492eb499d0b6760 SHA-256: 031cdfb3bdcf535b482ec39c7de36f0b284085186f638eea638bad8c4712df93
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://queure.ru/uplcv?utm_term=idle+fitness+gym+tycoon+workout+simulator+game+mod+apk PDF link annotation
    • http://yasaitogo.com/uploads/files/gebisosisi.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kemifikinolurebufe.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/waxuvuduruxugakatixamaw.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/386dbf112c52fe0a28d8c14a289accf1/zufinalikozisovasim.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/rotagodeluwutuwuvetu.pdfIn PDF document text
    • http://techielingo.com/fck_uploads/files/84422715069.pdfIn PDF document text
    • https://miet.hu/kepek/44429301215.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/16961767419.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kd6gh3sfl801mg30k838pjef4j/61158575448.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/tikasogomewibizukesiwo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090700321655.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/panoxobopowumukipagazivo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210913/file/47519856774.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20538482178.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/paraxaleradowatu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jujogigemokowak.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/pafoxalawuzigibaseduf.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/84233811483.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/webezifisojagubejowu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/77060441065.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/48087063749.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kalupeja.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/gagiduzomurutaketi.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/jabevoza.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 15280 bytes
SHA-256: e97abc60bfe417f3f14f6adbbffc09f0451a9eb586f5c03a3402d31e3e2728cf
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 11308 bytes
SHA-256: e51c58251fb551df733902e9dedd4d01cfd6a66d2ffeb9699cab4ff9788c462e