Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f5897ffe1434e7…

MALICIOUS

PDF

70.4 KB Created: 2021-10-08 16:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6be9e29207e5db341384acd422668bb SHA-1: 8bfb0afb7ef0c68b7a56613504706fdc48208b4d SHA-256: b6f5897ffe1434e74833a71e82c6b9660264110fc28c9922c580efa39cc452f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicates this malicious intent. ClamAV detection and ML classification further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=used+nissan+s14+for+sale PDF link annotation
    • http://cnex.cc/images/blog/file/19008790084.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/20084337987.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/48988238214.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/riwexarisutepevewaluxol.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/94766596946.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/11064025287.pdfIn PDF document text
    • http://videlec.be/ressource/file/95807359524.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/70896759359.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/8997395639.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/16341144320.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/giromasomibin.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/12922131396.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/54118362437.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/49d3614dc2c7da9e3ae58eb7e3388990/tirevume.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/38058302374.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021100709273785.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/38945204118.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/70683733357.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed8b47d0f---jasabesisufasevoxolo.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/tolom.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/63300412905.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_off0000b22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 10384 bytes
SHA-256: a8c1f1cf2d9603ba0d5cea1595fa7666c42c2736c44a464a76428e00e112148b
font_02_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16376 bytes
SHA-256: dec7c86357fc1f0e83acc1cabd39ba43fc488deff2f26d71486c6f845e5574f5

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