Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cd3c64e63efde1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 15:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6276e2edd8c69263d344b696c0b9b50b SHA-1: 016ef76ac16aa2f174c9b006f4faa907cc0fc16f SHA-256: b4cd3c64e63efde1baa15368e09579f6c39dc5f131c37e4e7bdabeed963a4ba2
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, identified as a link farm, suggests the document's primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=types+of+organic+reactions+with+examples+pdf PDF link annotation
    • http://capitaloffice.pl/fotki/file/94826242133.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dudegenelaweje.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210905_72EC7ECC789318AB.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/retatos.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/xosadivuw.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fomifagubowifekivuxugisiz.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908125933.pdfIn PDF document text
    • http://vit-physio.de/file/36712131615.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/31308422219.pdfIn PDF document text
    • https://edex.co/userfiles/files/renijejagareroxemafopuz.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/12883826979.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c329324---59343847690.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/dozide.pdfIn PDF document text
    • https://reha.bg/content/upload/file/dezaviruveluzibi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u1tiadm66bps7urp3vlog5eej9/26784611852.pdfIn PDF document text
    • https://sanagustin.cl/files/19694381130.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/65916210042.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luwaxenegiwegadawadiw.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/ragujevixo.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/purusezoxasef.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/domanojiwum.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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 18372 bytes
SHA-256: aac3599167ff533bb5e0ca78225b6f391ae33ecd700cb46ac3540b3c0a5a0bd4
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 11332 bytes
SHA-256: 0665de43ff2a45c8ad3e213fac95f6d5a084389106792bd7d5089020cb5fa9ec

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