Malicious PDF — malware analysis report

Static analysis result for SHA-256 981782ebe4ab7c4b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e26aec347492f2db98819f7000ca3b03 SHA-1: e01721c3abec7e22ca71d6c14d164f6d9dd6abb6 SHA-256: 981782ebe4ab7c4b54e114e41b2263e8656da5af1b2ea06690c265216406e463
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://topimmigrationlawyer.org/ckfinder/userfiles/files/70860782937.pdf In PDF document text
    • http://yetisirkaucuk.com/firma/files/jegavozakikufofexo.pdfIn PDF document text
    • http://bluebossa.pl/files/file/lubapemil.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/gigatupiwiluboxifo.pdfIn PDF document text
    • https://mahae.hu/files/files/68945748501.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/55388738796.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/piwalefogozumekotame.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/51798374327.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/tawasavugi.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/76336105816.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bewijimupe.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/jawirivimo.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/17830943946.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/52261838537.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/45366933849.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/lorepusol.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/ditorijamol.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147deb829e4e---lebupigomerivat.pdfIn PDF document text
    • http://santabruna.cl/upload/file/76579895411.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sufusawewiguxisenikawi.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/49386429326.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/didinawimewa.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/nigomijaporamidosujixuri.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/84947129224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tap+tap+app+pubg+lite+downloadPDF 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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 14852 bytes
SHA-256: f3ef411101f36395996c7af890bdcbf4e1b2b78600006cb33ccd4a7c5d1123a0
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10588 bytes
SHA-256: 907aa3d71be9a25b134d5b23853fc1328c52a42cfc897088c07c16b1cae6ee8f

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