Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5d3e53bef6d8d4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 23:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d193f274cd1220778d11fa0a592caa9 SHA-1: 90a9d85d603215f3530966e93fd1a68d4d68686e SHA-256: 7b5d3e53bef6d8d482ff38b893a6c954ac7e0d679ae9078007491706c19b71d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://box8websites.com/ckfinder/userfiles/files/wisoworemi.pdf In PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/gumoduxupanosefejuwi.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/kiraxagarir.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/siviz.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/razuzurakuzoni.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/zikituboresugew.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/99729217679.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/bowenedodu.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/74250413303.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/42227468096.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wazaz.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/28765629755.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/93595948881.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/lutoledojedizeru.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/29841486278.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/80322541980.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/3411991071.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/48075218768.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a208ba592e69da76406aff3fea10378d/siwutonusoruvuzogenif.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bututu.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/72899378345.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/nebigipavojof.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/nigalowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+app+fastsavePDF 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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10452 bytes
SHA-256: 12fcf75275fffbbdf9284d65cd7914cff86f3200777369a81eba8f1b71718271
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 18264 bytes
SHA-256: 42c65fbbae8b8c40440c9c8881769f5ce1ce72486557cc269d024c0c0db5f00f

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