Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a88cbcca2842b22…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 17:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7ae27117ee2e0541ef0ba0a1ffeb68e SHA-1: 9506f2338ec29209b2c846ddad1b9e18bf221f1e SHA-256: 4a88cbcca2842b22ad4aebba6de1a44068644e77eee36da680dcd11a7efc6dfa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bolshunoff.ru/images/wysiwyg/file/pisokafipawupobudu.pdf In PDF document text
    • http://kpotplace.com/uploads/files/jigiratab.pdfIn PDF document text
    • http://apex-architect.ru/images/file/zutirura.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/27335974424.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/80221563983.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c742e0c7c6de5aef302914e996ae6b5c/16572409242.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/topijuv.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210905_939A98ED8535446E.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/leridodoposojurazosoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a48060627---75465908338.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210901051133.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mosobofojifejurimed.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/dikebeb.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041324354781.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/65144705659.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/fumijines.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/2005165395.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/84856891090.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/88260979153.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/saledirederajuxixejusika.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/pijaguniremof.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gatid.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/tigupazubeg.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///poguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=arch+linux+android+developmentPDF 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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 18600 bytes
SHA-256: 7a69f09d0795715cf4a6617d333afb1a47cd47883c9ba238f63da31554ff404b
font_02_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 10860 bytes
SHA-256: 32399b5aad4cf57a1e945bf3804158cdca98cf981cc6d883671e2b56c534b783

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