Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b49052f222d440…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 127a0bcf7eb0e950c31c9440872869e1 SHA-1: 8730663e5fd12e9d4bcfa0f3d8f5abf731be8dfc SHA-256: 13b49052f222d440040b7c41e2c28c4c9fb05a373e58313df84166b86a59af88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tfe-design.dk/userfiles/file/sifow.pdf In PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/vaxamenul.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/foteziloguxamupuvude.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/62710084179.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/bewupevanimalipudefebago.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/sekinexokasapomodi.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/wumem.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/85897057543.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/4408117456.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/17338249144.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/66455378879.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f103ca0e7---radesagewimofujiguduref.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/ritilarijit.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/5427723775.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/16821856787.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5b0129758---sijaboxigitut.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lejijujokupolezapuma.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/85845942241.pdfIn PDF document text
    • http://slsnn.ru/content/file/mogejavos.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/71288631805.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lazunokegedeguwosojesuxiw.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/98957097035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=visible+wave+frequencyPDF 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_off0000add6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD6 10732 bytes
SHA-256: 9cf281d40a00ceae1881de651e46852ab0c48a7b0a1fcb00977479075e8fb32f
font_01_sfnt_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 15788 bytes
SHA-256: 6a44729de5f347cd151770f9e5c13d42c8cd7cb4835da57bca440a28a8398178

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