Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bfa8797890af53…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 19:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3de5ca4a1632c3c2a783c794cd50d749 SHA-1: 2a534a8f8e14d7088883dd950be7347ef821229e SHA-256: 62bfa8797890af53cd7c38290d0c846ace0573cf478ec0898b2dcd083fa4135e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of numerous unknown URLs suggest a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://alacarte-design.de/userfiles/file/nojujorazezuxatetozojor.pdf In PDF document text
    • http://chiaranannini.com/userfiles/files/7674761980.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/67175198346.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/jobevoxuburo.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/melonokakufiwojabigakes.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/76756677392.pdfIn PDF document text
    • http://ombs.ru/uploads/files/90222074102.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631539216.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/loxokewewelu.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/81900151768.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/399277224613a656922ff9.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/46862155445.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/19771994609.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/88200526619.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/vorokudirufipuropefovato.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ruwajetajiba.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c823597cd840990d062ea606b2020fe2/weligakuvamuragofid.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/17396914137.pdfIn PDF document text
    • https://interconformity.ro/images/file/gejevifodejusut.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/lamenase.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/12000333622.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b0d43bb9---4796049911.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902192153.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/32658219551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cv+design+pdfPDF 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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 19164 bytes
SHA-256: eab503e11b45c554655a8213e6ff334ff020eb2e579288ef8f654c2b7d41c047
font_02_sfnt_off00013d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 10244 bytes
SHA-256: 3bbf2200bc4a9302d5bb0ceab946fa303d84efa8912d5954fd4a085b728c5909