Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cdaa99a1066d6b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 04:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c179c1204871d76620aa2927bab590d2 SHA-1: 54914d5ae54cc8d1ecbb1ad9795d4d2e2c44e96b SHA-256: f6cdaa99a1066d6b5cc8556c026fc620dbc05b126dfb387cadde883c64e5a70d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs that redirect to other PDF files, likely to obscure the final malicious destination. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jobtiara.com/files/files/roderekefewefalisa.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/lalowaruli.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/23062561473.pdfIn PDF document text
    • http://kco.su/userfiles/file/80115231687.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/xowozoletupubogaguvek.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/bejipesado.pdfIn PDF document text
    • http://inercial.es/uploads/files/mupunatexoze.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/ruwixuluvel.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/83982885436.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/37869359699.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/36905018571.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/xepen.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pitazikin.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/xinabuk.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lisaxikenezadiwunimawo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1e47fd27---42952073551.pdfIn PDF document text
    • http://candientushinko.com/images/file/64201599432.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/rozupoxiz.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/vifuxaroxusepenawolekolem.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/20853075423.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/samipekuweve.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/57775639542.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/nibaduwidajevig.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613284e697a9f---vogetubegapotew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kafka+on+the+shore+book+pdf+download+freePDF 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_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 10812 bytes
SHA-256: 7e7430ede1760ebdaad3f9e92721cd19baa12f17d42352551736b1d222ff53d7
font_01_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 18440 bytes
SHA-256: 3234bfb8ac4449ed119f0ce6ea38c131ef041fc74652d5250fa762a912067bbf

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