Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbd171df2be75aa…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 05:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0866950ddec4776f79d529c4f4f6b392 SHA-1: 711b5abf83f4c560120480afbccd36e0e035f35d SHA-256: 9dbd171df2be75aa186969c9621f20a42298c7b866b3f7c0d712e85480803925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, pointing to numerous distinct hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615108eb95129---gepifexub.pdf In PDF document text
    • http://centrons.com/uploaded/file/6156025786144b06e148df.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/kigabogozuzovipewibikeg.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/94154991172.pdfIn PDF document text
    • http://standardamulet.com/files/files/tolexiwobufe.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/6114041545.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/88205589167.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/1360649941.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/90269146657.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/fatijobagarojanekosivo.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/20180326288.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/38989457582.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/jobuvinuruja.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/14079571341.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/dedazetow.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/lefibozijidevijerepera.pdfIn PDF document text
    • http://dytac.hk/userfiles/47737452995.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/parowovala.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/lukakewijapejonab.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/tupanetezesadu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/motaxexamusisirulo.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/38300341290.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/28886080959.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_145700.pdfIn PDF document text
    • https://adikmanis.com/contents/files/21948340919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aplicativo+para+baixar+videos+no+youtube+androidPDF 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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 16240 bytes
SHA-256: 063582b5c42eafa498d1e1140c8710e192d125bc2d4ed40fba9c53afff95fc7b
font_01_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 11012 bytes
SHA-256: 691ff383b030549325ffd8aac4db92489bd00a5dc7ba74a75a1ab6bc515d65fe