Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0de58463891cb2c…

MALICIOUS

PDF

83.2 KB Created: 2021-10-12 11:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41fba2303ae123a75d66e2ba094730d2 SHA-1: 22355098c36f32e1262e4c7ed48f2fc944aef57d SHA-256: d0de58463891cb2c7124e4b91827dff4d665b2b42fd4de61b70dcd9a37472b0f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable hosts. The embedded URLs, despite some being marked benign, contribute to the overall pattern of redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coastalholidayproperty.com/ckfinder/userfiles/files/76167689919.pdf In PDF document text
    • http://fabrikando.com/cmsimple/images/file/nekemajadeg.pdfIn PDF document text
    • https://cubic.is/userfiles/file/14259876077.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mezorepub.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/lakadegenavefuregadosozi.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/11327927517.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/92977790827.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615452dc02464---91851030578.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/rajadizonowofixebim.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/25018222047.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xibexa.pdfIn PDF document text
    • https://chilepools.com/contents/files/wijasikomitogetilugoku.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/fafararowebugizuxes.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/82610578175.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/magixu.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/kanikudimonugebawo.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/dekifibogovoxaletesis.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/tiduf.pdfIn PDF document text
    • http://exosushi.com/uploads/files/terudufunivom.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/03d3af1b8a4a0d27dc54245a9059c7ed/wusadufujutojotofikez.pdfIn PDF document text
    • http://podarox.ru/public/files/jemedexoxosigi.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/35464744422.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=happy+anniversary+quotes+to+my+sister+and+brother+in+lawPDF 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 11300 bytes
SHA-256: fd105fce9605cc63f8095865e3e234995ab9a759db28609b52ea865246eb4ff9
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 21548 bytes
SHA-256: 8190b20715f545f6c8981366f1c8c76ec34882afd44eb8c8326ca1eb2917f749