Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82102a844cc5836…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 23:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f93ef489e39f9f7a6fc03ba807d3010 SHA-1: 586092866d5aaeda93d46ee59b6c29a3f482fcdf SHA-256: e82102a844cc5836b0a49868d3fc8e3100118d4600c9539fff47ec1db019a771
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=coc+hack+version+s1 PDF link annotation
    • http://villabrown.it/userfiles/files/kegasikazidi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109200907439026.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/futakipesof.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/50530902171.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/94865418932.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/penofas.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/52547864837.pdfIn PDF document text
    • https://kokomanis.com/contents/files/simenozaw.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/75127700085.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/79680922629.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mezaridebivisap.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/23981214057.pdfIn PDF document text
    • http://ping-property.com/user_img/files/21562643047.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/defonugevomedesezofotaxox.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/15568279865.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/tunoxonipoz.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd118c6f9b---99036641339.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/67134333099.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tiror.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/73312800333.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/19600290518.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/22065389627.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a502fab12106950f71874ae3e3af1a8/80108182507.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/pufibej.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/dotawafimafiguwadumilefiw.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_off0000b60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 17940 bytes
SHA-256: 407fd28fd30d13803b618f462cae09b7960d4cd2d8881b4e1c92c8d44026d006
font_02_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 10424 bytes
SHA-256: 737c2ad07a97376797e8f99d62facf84c799f823aac9b04127849acc44c45269

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