Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9719dde71d2664b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 00:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6706cfa9e9730e1f7b56734e57d20b5 SHA-1: 8b21e0a7311afb819f0858d66bb1eaee52c47165 SHA-256: b9719dde71d2664b99ba686f197ac120b93acb3aacef551eeb67d8eda209ca03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm, pointing to numerous other PDF files hosted on various domains. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or deceptive content, potentially for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161426f33ded9e---desaxufe.pdf In PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/12365687538.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/64177217183.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/30612225690.pdfIn PDF document text
    • http://boki.hu/editor_up/24650649683.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/82343299882.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/tadot.pdfIn PDF document text
    • http://asvpp.fr/pdf/56450139228.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/tofugamizimevunavufewom.pdfIn PDF document text
    • http://sbcnepal.com/images/file/99791922758.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16140e96fe4864---fopurejomuwojex.pdfIn PDF document text
    • https://upaspor.com/resimler/files/gopux.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/83645605991.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/33664287085.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/17096776908.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/28655226091.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/31403307272.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/sanesobosar.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/kuvip.pdfIn PDF document text
    • http://logicamail.it/draft/media/97274663677.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/parilunediwinazixudebez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+a+video+to+a+wallpaperPDF 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_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10516 bytes
SHA-256: 4941aff15defc263c5b8f3d0d6ad41ef8b995790929b192f97e4a45f51dac6e9
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 19532 bytes
SHA-256: cfa06ebf68aa2a247dfd7b6688f37792ec91ee85601e6c997e88f06c018e96a0

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