Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2279d291ae0b4f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09b05dec46f248c2c045327eb499d7a8 SHA-1: a75b3a2584a7ea475d324b5c93e185765de85de6 SHA-256: 4d2279d291ae0b4f2c9092c99d3d35fb5caf8ea28211149653153cd124136e34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The PDF structure and heuristic firings suggest it is designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.gurkhasfinance.com.np/ckfinder/userfiles/files/55344850773.pdf In PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/tuviwus.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/67398580658.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vedobikilolujox.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/medovu.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109061927473018510xk9p.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9aa6b2587---nitujamelota.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109080050025603.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/26341019467.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/70724233147.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/25401694960.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/44340162411.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e1858ca5---48187018363.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/75041506678.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/difigawolelukinemifeni.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/womisuwik.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/98257186356.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/49412171608.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/fenenen.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/67569577621.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/4148983262.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/97185278100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=giovanni%27s+room+book+pdfPDF 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_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 10752 bytes
SHA-256: 0e4ae1e2dcb399c46aac5561c4250c5abdc11167958fd42bb3108c986ae47e9a
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 17632 bytes
SHA-256: 9d5e53c85800592c75ba20ed080d5dda61070db29de5f3fba87ec300c92e401a
font_02_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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