Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee7a2df3e74495b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 04:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01fb2e1f630dbf196eb2cf61c1ecce3a SHA-1: 6058f344557c5450cad20377ad8e9f98ae9932e5 SHA-256: 4ee7a2df3e74495bf5389cf813baae57508d928b1f141d8c62acee30768cd38f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a network of other PDF files hosted on disposable domains. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript or exploits to achieve its objectives, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cauthangdep24h.com/upload/files/74503642691.pdf In PDF document text
    • http://thaifilmind.com/UserFiles/file/dewibulevevad.pdfIn PDF document text
    • http://platcometals.com/images/file/giridemugepofujepodep.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/46715318735.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/82060920825.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210911160609_ekbwg6.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/foxas.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vefij.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/vufifafoxen.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/96393811135.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/tesobixekujut.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/balilojitamofadokepon.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/94352833760.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/20143710076.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/fejal.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/dedore.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/92440172934.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/39550928794.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/83520269865.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/murulovemipaj.pdfIn PDF document text
    • https://clubon.top/uploads/files/44456851894.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/genopenikebe.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/39120674055.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/54651835849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=avengers+infinity+war+4k+onlinePDF 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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 10804 bytes
SHA-256: 9c16cee0a52c329ccacbf001cc7980d09ab03ef9bc69a44a484941139c652389
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 19176 bytes
SHA-256: 3dfdb6e2f44cc36bec688ff657de701933b9c289c7790dacfca123e26195df41

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