Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a99892f6f94e650…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 17:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74ad421f67f3216711f38d2e8fe15767 SHA-1: bae0804957a1dcb3c5b38bcb09df19f6a372edde SHA-256: 0a99892f6f94e650f6019f4154715c71ccd3373d40c61b3550c534dbb8649fb9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains and structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xinovowolomebofuvebot.pdf In PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gorokusejudaporomepisag.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/18194276012.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/43133245119.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/29888757689.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/70857801822.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161409980be4e7---bumabaresefepu.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/laxofuvafigidow.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/bilebuvokivo.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/todeki.pdfIn PDF document text
    • http://platcometals.com/images/file/6651682952.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/19781056640.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mevufetobalodux.pdfIn PDF document text
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/92094930360.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/29499197682.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/gurulususoxek.pdfIn PDF document text
    • http://jfe.hk/userfiles/5537484812.pdfIn PDF document text
    • http://mariancozma.com/_user/file/pofarokixosomifemazem.pdfIn PDF document text
    • https://scalping.ir/data/files/file/kuwerigizekenepipojezelim.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/67822388529.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161361e0ea9131---22967259355.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/84885918627.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xipajojawejeguvitig.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/41761249330.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/95949029895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rimuovere+contatti+duplicati+androidPDF 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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10716 bytes
SHA-256: 8a35794ac79132ed98c1337c4f2ca5206e1776f9efd8cba9e8703ad9d96fc02c
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 18064 bytes
SHA-256: 632746d83a9826441e4a5817aaed3fd699ebb63c29526403983491488e4d9ca8