Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30842a9d3c6983e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 20:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa52375c22cb512f7ba083453dd77e02 SHA-1: 8973a8371194f0d3a8192bfc57fdb99a824c84c0 SHA-256: f30842a9d3c6983e7017c0547d49dc29097a3415e4aca918fd3eac9010f24c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the pattern of using numerous disposable domains to host PDF files, likely for SEO manipulation or to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=app+tv+apk+download PDF link annotation
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/pitoguweb.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/wagudibepib.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/bonuzop.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/sonamarigixujowusepomes.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vesutugukerewujuxovu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/896655810.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/lojajososenoxowegalidi.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/42591654034.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/47367329608.pdfIn PDF document text
    • http://otczenacts.com/media/files/48514392954.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/gujidogenidad.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/kogodewefefaxunafe.pdfIn PDF document text
    • http://vodnik48.ru/content/file/wulej.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/43727730886.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/14150706488.pdfIn PDF document text
    • https://istanajp2.com/contents/files/notomodizarusobapok.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/22739072804.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/sudupavegit.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/7047702684.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/xajojitiredajomalol.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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 10116 bytes
SHA-256: 0aa2b9e772f11b1e8452b1f99f0c20002a6302b7befc87ab2f2e076f996825a5
font_02_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 17736 bytes
SHA-256: fe878fbe17fa1bd71efab8e55d4c134c1aab5a65eda573bd8c4363b780022f4c

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