Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec17711db2ac40c6…

MALICIOUS

PDF

92.1 KB Created: 2021-09-17 15:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e03f9940a66ef9166f94176cad41187e SHA-1: 52dbfef32b89d89c11d5aeaef32e4c20cf61df34 SHA-256: ec17711db2ac40c6599c85d3a32c1f5ba57fedd5170a6414651431a81a5d31b1
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://architectureanddesign.it/userfiles/files/javedumeki.pdf In PDF document text
    • https://osakaav.com/userfiles/files/13748138095.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135313672011---wanatovibako.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/34701658421.pdfIn PDF document text
    • http://cx-gl.hu/images/files/1641550393.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/gikijonidowa.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/25693586922.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/77120876057.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27683226368.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/susigolazabekojobipaw.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/90505849418.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/52671454730.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/7204989391.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/38587430455.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///rodaje.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/jevikakarabagefipezusas.pdfIn PDF document text
    • https://dintek.eu/uploads/file/walavojon.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/kikijuzasorusanidanov.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotolejureso.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/68169445776.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/ribosegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+for+stopping+background+appsPDF 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_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 18208 bytes
SHA-256: 2e6a70e47d44154b0c6a7db2d053875f1daa74c387818777d6e3badf6703289b
font_02_sfnt_off000148f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F2 11132 bytes
SHA-256: 48102f7a865bed43fdd07ee01aaeefc203e104831a91eec68d272aa93fdecba7

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