Malicious PDF — malware analysis report

Static analysis result for SHA-256 be24d3779df515b6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 20:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34a54060fe62119da02fd6fa9ada522a SHA-1: 4c6ec3f712d02ac72cdbce9d476a4eb4f5cde3ab SHA-256: be24d3779df515b61275829a56e7b6ddc67fbbe089e61abe0c372de49f133c05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+4+mugen+download+apk+android PDF link annotation
    • https://psfund.org/public/uploads/files/cms_files/mugekujilidi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b1597a94---5488668829.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31620461680.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/37674576920.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/75584463545.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zafibesidixokugafiw.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/berilapupos.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/luxofu.pdfIn PDF document text
    • http://esangsok.com/upfile/files/92653158298.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/furelugarinuxebe.pdfIn PDF document text
    • http://edallyshop.com/upload/files/46344034404.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/miwoziliwikozulav.pdfIn PDF document text
    • http://sinostandards.net/upload/files/pixid.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/xenijodonizo.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/7787570614.pdfIn PDF document text
    • http://le383.com/uploads/files/zedunemusafuxaforevo.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/25039870203.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/vazakijusojilikoremob.pdfIn PDF document text
    • https://equinox-e.com/upload/files/63156436794.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/12046864573.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3d87e3074a6bcb8633c81c51c6e2eec1/30067462504.pdfIn PDF document text
    • http://net-work.cz/data/file/panavekuvazifo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/muzegisuxefoxisabag.pdfIn PDF document text
    • 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_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 16816 bytes
SHA-256: a6c54b96e06eb5f8b625fa61642bbd83600d12557bac19a99cad6a75d6c2c653
font_02_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 11196 bytes
SHA-256: d3f48b7a386af9f84be890bf032917693579710fbaff14afe70564406ccccf60