Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f5ea3c1ee2765…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 13:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61dea13daa6bf026202666ed22445b2e SHA-1: f8ae497b668c2d04e8b3263795f8b6b61c04d449 SHA-256: 883f5ea3c1ee2765ca314919a3805b4dbf32a04f6260103464a8d723758b497f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing site or malware download server. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--90ah6akb9e.xn--p1ai/f/file/bezunewodarajidawiwipujep.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/gululuv.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/98593522528.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/medetoma.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ms64jripakdust6f8lltfhevp2/46191713068.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/93340056077.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/96543664423.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/35546115676.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fadinojulobewipa.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/13942363093.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/zepexefo.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-5/20210905072636273718.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/siwisojexejurutu.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/mafumiledarobavib.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/96811549535.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lotifejimifinovekurevib.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/55449823300.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/85809648565.pdfIn PDF document text
    • http://adveotec.com/img/file/pepoz.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/14325441290.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/2990731157.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/39502267974.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/19454617264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+power+managementPDF 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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 17164 bytes
SHA-256: f280ef638efc0c12844e8ba8a1b843fc31768244bab8e55d9b1b1d48ab4dca99
font_01_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10588 bytes
SHA-256: 83ce3117ab457fb54bf3125818064f59ea8aebebbd1d74c29af8645644905750

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