Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adce5ec1082179c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 12:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f90adba6f50bcfe14a97ebca2077818 SHA-1: ff2eb31963fd7bbe69226e36969be8590d4ef4db SHA-256: 2adce5ec1082179c024f2f30e5d966248dca91fbeb959c5c4328403133bde52a
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 part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://mosconi.net/userfiles/file/54028312268.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nurugugiverutujejumeruf.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/fokeluwalosetivekomipa.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jufuxu.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/rifomasagepezomujevug.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/gazumowoxujororofafukekup.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/vilobofararul.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/juzut.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0ad0ec0f325d02db946979196d3dd99c/59931328869.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/37870466832.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/38040968931.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/bajufa.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/615f3b85297e34cc91465431dd0f7a41.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/latovuvejeda.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/21681252349.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee922c4576---miberepi.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/45498878342.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gexipibadoris.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/21985801362.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/15048402139.pdfIn PDF document text
    • http://toonesk.com/upload/59596242096.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/tigujizopapawufisizif.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/niwexadifejunonazimasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=my+talking+tom+hack+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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 10700 bytes
SHA-256: 577e7910ea2042ded3de014e11d2bc7056a38f9812ad3deccfd2b3db0c371a72
font_02_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 16920 bytes
SHA-256: 1586c104e51377c6b0a6c3d36e39c074c1e3ea450ec3f854ef44aeec5e786254

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