Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde366172efa3a7e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 18:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eab524005544a09fae01d06aa1da0e1 SHA-1: 480e6b8e964796dac0f986b45ed093b2ad9bba7f SHA-256: cde366172efa3a7e436bdc90d0f49f0a2800c1edf3e7c404280a54ad08e6ad37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or distribute additional malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pagyesa.org/userfiles/file/20210908184611.pdf In PDF document text
    • http://shanghaiqingchen.com/upload/files/putedapigutofokemuvef.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/92114079583.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/tivexakibopojuwaroto.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/vosag.pdfIn PDF document text
    • https://hinaweb.com/upload/file/delemofi.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/nejetewavalipudeviwijak.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/towopu.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/22658956287.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73010904176.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be3e8a39f---5144119520.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/fijubisunonumolimig.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/69900847177.pdfIn PDF document text
    • http://tayles.com/uploaded/bamel.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/35727375921.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/3805377878.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/pigib.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/77705290596.pdfIn PDF document text
    • http://ned.ru/uploads/files/46384574968.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/93654507102.pdfIn PDF document text
    • http://clingac.com/d/files/wefase.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/bowewunuzatagirivutolewib.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e4fcb890---96072799182.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18651902890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+uc+no+human+verificationPDF 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_off0000b97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97B 10532 bytes
SHA-256: c5bd5126906d16653fce554d6e501fc7d855fe97c6c2a8d56ef1bcc98473fa0c
font_01_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 17460 bytes
SHA-256: 2fb72b91de85e0b6d2b27941955307470e20573a9817085ae0e14032be453eb1
font_02_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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