Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea374b9ffe27233f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 15:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd23a690bd31738ee0d0c6dc6c32d187 SHA-1: f8499c47ca1c75e4de3dd56e07310ed3b4198956 SHA-256: ea374b9ffe27233f72f739a8f96a1e93c04755777c0bf910c64dbf76ee4921fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, noting the document's structure is designed for SEO manipulation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=top+1+game+in+play+store PDF link annotation
    • http://kasargod.net/uploads/file/49070632744.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/xojutapudegumixisugiz.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a739b363f3ec97c2209253f0023e4418/jigutazizapozam.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/taluxizibekag.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/31133741373.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/32528356555.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/31924403997.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/60917645102.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/sevasurewi.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/sirovedaxebobiwitojofeli.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/79997921970.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/mifepesagisaw.pdfIn PDF document text
    • http://xsjprinter.com/d/files/sesefarajopefixitujusim.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/56622042466.pdfIn PDF document text
    • http://keacg.com/upload/files/tojutotemoniwaru.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/10486205244.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109050451296397.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/sajodavilok.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/46742431016.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ef034f21---16424493399.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/kuvofukusemujopa.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109101150201897.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/gapagotejapoxenedan.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/76822525844.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 17604 bytes
SHA-256: 97a4aa03eae931c0c8cf2c2a7687b2d070fcdadba75596127d80351930b319cc
font_01_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 10724 bytes
SHA-256: 863660f5a3444bff8b59206dc3bd39c8e58930baefe8ceac3d124a6b5308dae4
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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