Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ed7b80c17752db…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 10:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2f89fa3ca23677513875fc7db83cf80e SHA-1: 8e4a4e0a3a0e2e416b9db4093eb23159f70494ba SHA-256: d5ed7b80c17752db5b20f66a3a9fa4693a1305ed33601422538f78a73f2ab341
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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
  • 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://kukubara.com/zdjecia/file/41826018842.pdf In PDF document text
    • http://malabarisproducoes.com/arquivos/files/toxuwovasarobupapimagi.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/94454033291.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/dogilarefekunajixugodix.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20108513239.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/siboxofizobenedopodubedum.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/86904514200.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd29626b81---88323910468.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/60262252743.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/dasowibozikegabu.pdfIn PDF document text
    • http://nenorm.com/files/files/fajep.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/12199455034.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sikozofebeg.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/79890805503.pdfIn PDF document text
    • http://cutskytools.com/d/files/xivovagukikunexu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/26407621880.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feabd8f756---pinuzisul.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/30929703060.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/moxopajedunekivasurodo.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/konetelojigokinibudezaxu.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wulixefebafepapaxiradaza.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/22573361079.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/70193121156.pdfIn PDF document text
    • http://plncse.hu/php_data/file/tekaxupixixudesoni.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/40166338476.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/60253970181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=general+form+to+turning+point+formPDF 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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 10672 bytes
SHA-256: 9287fcccccb8106896e574de8eb708adb7570be78b6c6452eb881f77050a060b
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 18168 bytes
SHA-256: 646e2eb137113094eb07d0404083a6957d33c22be0503c80fedcf610d7036077
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1