Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c38f1e4497e09c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 07:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 931913aa9bce5cf12e6ab159089346b4 SHA-1: dc70594cf00ae18bee01957ad9890e602082df57 SHA-256: 09c38f1e4497e09c9980d45f78da74af75d7db5e72592bf20b20129388de7b57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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' indicates the PDF is part of a link farm, suggesting an attempt to obscure malicious destinations. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf979992bc---252857077.pdf In PDF document text
    • https://dukra.sk/editor_uploads/files/zomitu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_0F63499F5D28A423.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/jibuwiboxanuxave.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/julijefajafi.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/karexaxoxobitim.pdfIn PDF document text
    • https://palet-school.com/files/files/wetepubexofezite.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/dexama.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210905033506.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/gunukelimuvogorog.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fobokoxuzexulikuke.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/senevonilesuma.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109070333322652.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/86707009829.pdfIn PDF document text
    • http://baoveantam.info/upload/files/65553440301.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/81902560523.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/fusodolugojiviwolokuvet.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/44681432052.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631291788_68d16bd67c.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137549f144ef---nibize.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/42558120095.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/jirajuverafulaf.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/nurigudakobefenezuz.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24289676341.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/mojuviga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=recover+files+from+android+phone+with+broken+screenPDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 11316 bytes
SHA-256: 1c0b050c6a1c2e3b8707bd632ad98f2cccf12a5e3a8f94e344f6335fd396c7d7
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 17528 bytes
SHA-256: 70c2716f03183415678c0eefd9421e6e805ff248472a77cd3e4cda703b2d0c51
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1