Malicious PDF — malware analysis report

Static analysis result for SHA-256 082ec6238e2f7d64…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 04:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 489d71e32bd05e6a404e354e797f699e SHA-1: eb881edee5d815c442aa2e558cffcc656311aa13 SHA-256: 082ec6238e2f7d64938fe4d6a55e0e7dbeb2dc9f32f000030e50daeb16d78486
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external files, suggesting a role in distributing or linking to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm structure designed to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://vtaky.sk/media/file/9114843556.pdf In PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/52618150365.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/71990001535.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/72922032474.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/gawolefotidelezirewivivew.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/vujadop.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/57394205899.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/nikinazu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/61946342269.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/52179465062.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jenusefiluwow.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/xexilufexupusijitij.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/zinewanofitojewofidobedil.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/pajaroxo.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/4232132571.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/25422465967.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/44870848695.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/wosirasurivokupubiju.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67195104722.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/domunu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d8c72cf8151dac9d8dd0eb9f28f56788/xanepojiwajuzalizida.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/soxesuxijuri.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/simonetigutowelutogijomo.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/xiwerogozuluji.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/77306676245.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/baletefavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adbanao+pro+apk+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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 18360 bytes
SHA-256: dcc10771a3c8af23c91543d3d2878d89e0a8dc52a2afbb864e73909bc71c2a18
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10192 bytes
SHA-256: 3909cf803490e6827307f7f57867e32dcdb098c0ee1495c91e91721802fd59b8
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1