Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2023c5786d0c4e5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 04:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: afb790440d7fa0ad4412d22a7eba8423 SHA-1: 1b6ba295af1b8a523a44915176e7b69315f86220 SHA-256: d2023c5786d0c4e538216df9498f51736aa6d8361a16eff75cdd5de690efb075
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://booking-news.hkdnracing.com/webroot/editor-uploads/files/84607194344.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/guwudis.pdfIn PDF document text
    • https://j26clean.com/upload/files/37595662037.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xizonifolik.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/82276126751.pdfIn PDF document text
    • https://comfort8889.com/upload/files/24366104209.pdfIn PDF document text
    • http://elitacasa.it/images/file/92106158694.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/71368929721.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/wufosepijujepepo.pdfIn PDF document text
    • http://sergeybazarov.ru/file/11922137605.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9ddbae55---40779824896.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/rufer.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/poreranugubesefuwekaz.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/bogedimupusufegabutuxe.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/67649523943.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99604093117.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e2dc52ae45ad39c4917483fdef3146f3/25345994335.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/nigirejax.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/sozafoluris.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/lusasifo.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/61013967998.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/48039372814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=first+50+jazz+standards+you+should+play+on+piano+pdfPDF 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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 11100 bytes
SHA-256: 592496293965f0a12d5139b308c9d1a2f5bfbe89dd62307c402334cb02fa7732
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 17840 bytes
SHA-256: 31400312e2b86022a4cc7d38a733e4a093e0805dbe78e5985878135866bb8ddd
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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