Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0334b3f810ed8f4…

MALICIOUS

PDF

74.5 KB Created: 2021-10-10 09:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ccd6099e9961fbad4e699c60ba9846e SHA-1: ddd16e6020109a326290f002037cf6532c9d54ec SHA-256: d0334b3f810ed8f426dc09657591d7c773850b94cda14b631011927559540b8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting, strongly suggests a phishing or link-farming attack. The ML classifier also indicated a high probability of maliciousness. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pixomot.ru/uplcv?utm_term=worksheets+for+class+1+english+grammar PDF link annotation
    • http://precisao.net/files/files/puxivavananutugowosod.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/muvepenemirived.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/94203080156.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/17533865506.pdfIn PDF document text
    • http://novichiha.ru/pic/file/biwobapen.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/35607806098.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/tuvuvo.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/93376470185.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/64942930341.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/48680784378.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/vesokuluxipiriposiwari.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2esgh2s4sjr9rkhcvkr1uoi10c/nuzupob.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/23381365208.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/genun.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/xomofevenu.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ximokomamuxaw.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/rekexufomab.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/83516691949.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/99422592322.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/xesilodukunavenev.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/bajijuzopamawefefa.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/gabasupexusepozadu.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/46694398228.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/belobaxebomelimez.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210918_214B19F40D0E7176.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/3017434447.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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 10920 bytes
SHA-256: 048a4eeb3d82013d6c9662f23bce129dcd565c6557e832bf0eecc9ec0b416a53
font_02_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16708 bytes
SHA-256: 1a011280150c4444177be95dc1bc1b37c2976f34eeadab62831120893b6e5a28