Malicious PDF — malware analysis report

Static analysis result for SHA-256 866fec9062c25143…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 11:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 147941794f8df9b758fbeb775776cd66 SHA-1: 0b5b91f2108ae7dca00871aa30c36d6164b7234e SHA-256: 866fec9062c251438ccf957450a905af26752de2ffee03c03a91477d77b50fef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is designed to redirect users to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bensonlandscape.com/editorData/file/42441657554.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fde3df7f3---45553092768.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/nonemalano.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/10325761395.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/xogitewazibazi.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/38180182128.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/51104810818.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/sevoxularonabodakakexafo.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/19313625154.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/54316283783.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/15154899775.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/dabumofexopitu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/45183201995.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/nenaleroguge.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/27825974895.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/49300764113.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/fumokatabirugala.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/vapegamadudadupejub.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/25671686894.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/zojogezufog.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/jemibupusegamekovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fraction+warm+up+gamesPDF 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_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10832 bytes
SHA-256: b5dec37637c30ae1c77aa96b7c732d1d95e3e59616735103b5c7450ba285feeb
font_02_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 18028 bytes
SHA-256: df29d104a2553609230a848e890dc2ec34b0ffa64768a50433d31c9ec4ec65e4

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