Malicious PDF — malware analysis report

Static analysis result for SHA-256 0249ebf8dd2bb033…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 09:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5e615e3de3c4c9e9836c7d5c8f25072 SHA-1: 2f249fcaa57f1f078f383cc2116ba2623869f1ce SHA-256: 0249ebf8dd2bb033314d2f55a2d150891b2b43da8704f2e963389cb46944df64
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=android+system+navigation+buttons+are+turned+off PDF link annotation
    • https://birotex.rs/images/files/2650835409.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/20228221744.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/zupepujokubununajere.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_478E81193D64AFB7.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/50136153161.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614283bd20a98---rizimizufaxuxakekegi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/zexasovoda.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/veruven.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/sozodixe.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/fewusizoxinot.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wobuwoziwajekabonoveruzi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614450da40529---69689431862.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/70015260358.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/99579748270.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/24994032065.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/55919300113.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/bowili.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109092117459930.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631528933.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/10794698483.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/94491394383.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/zonidavidomeduxadat.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/91785931486.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 11052 bytes
SHA-256: 2b8298a8bcac0629fa3ba1dff4e5ec67c202ae178853c2f546ee4ce9c38eade8
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 17428 bytes
SHA-256: 546d61f58ed64a15318f3d57d4122e06ddf13a5bd8156db5286fdfb7daa170ac

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