Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dd145d767534e0…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 15:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7483d2664e6fc1f821fadba0c4d81b7a SHA-1: aad02655fa9e8a46da70c8d0d95590ba2bf6568b SHA-256: a6dd145d767534e06d4b85e457166df96d212c94b3e621d3d55b679cde2668f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous external URIs, with one specifically using UTM parameters, suggesting a phishing or redirection attempt. The presence of embedded URLs and the link farm heuristic indicate the document's primary purpose is to direct users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=the+gettysburg+address+text+pdf PDF link annotation
    • https://weboonline.com/ckfinder/userfiles/files/xovolipevomorunipagiwusuf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1cd34cd8---78990972278.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/92244677581.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/36043174537.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/lipewekumakon.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/84119605563.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/10888595439.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jilinotosolikedi.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/zopubidoteruxe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5f4c59b0---33588645354.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/69546934121.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/bigirigubudanuzebiku.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/11215708772.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/33953507040.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/62270711850.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xepakamekowulakutato.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/labajekol.pdfIn PDF document text
    • http://rjt1.org/upload/files/91877695290.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/17623307021.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///wuvezeze.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/fusediwosopisitavodikemej.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/tuwilotapasitukujowodisif.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/defup.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/woxozewuvudu.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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 17388 bytes
SHA-256: d4fab67819865929c81bf27cc9b5ee71a0919914edaa184246949af7be0cb907
font_02_sfnt_off000136c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C7 10832 bytes
SHA-256: 639b8a84dc9550dd482630a3fde9c08ccae9173940d72418515cd7c50ed12129