Malicious PDF — malware analysis report

Static analysis result for SHA-256 b251991662012180…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 23:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b516e2557e832503499d6d48b33cad17 SHA-1: f7f7cb063051d883ac06e2a43484706e58cf0412 SHA-256: b251991662012180636cdd363485c96b27a52fb6e3399385c83128e04c24666c
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 trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=unlimited+money+cities+skylines+pc PDF link annotation
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/56257947466.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/risirebowuniwazexupolifig.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/79973774761.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/84087569991.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/sepanafisiwunonakebode.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/11804541229.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kinozawulebumisozel.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/jigixolidid.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/54351918727.pdfIn PDF document text
    • http://elitacasa.it/images/file/benajuna.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/65236040752.pdfIn PDF document text
    • http://ilovestory.com/upload/file/sevadukew.pdfIn PDF document text
    • http://sireny.net/share/files/94723129062.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/81126564502.pdfIn PDF document text
    • http://stonebreaker.at/81903604929.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/97540771708.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076440bd26---84328215435.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/66933384796.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/wokevu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/gederameweduzaxi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/51052330810.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b8bcccadc0de3003b0cd354f8c07fc67/sixinupelowov.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tulavuvobevuf.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gelija.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/rixotosumediban.pdfIn PDF document text
    • 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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 10628 bytes
SHA-256: 338a455857403e19eb2879d72d319d9a6dfce7dfb48974807005e54fe091ed45
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 17868 bytes
SHA-256: a8d5d85fdc5db5cde3ec8ff4cc4df84c4d65db7b257c7ab597f8cacf2f99ae9b

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