Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e2a6c574467849…

MALICIOUS

PDF

78.5 KB Created: 2021-09-25 00:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 303f0aed968a091ac84f44c409fcf755 SHA-1: 4862af1a23fb1c900f60b9e97afa199b0f4e7889 SHA-256: 33e2a6c574467849a2ba497c66ed9bcb611753d13fdfa72789a1176560345382
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://ceccarbotosani.ro/userfiles/file/30984108811.pdf In PDF document text
    • http://sitoad.com/bbqjoekey/files/202109011112148112.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/94690399315.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/kikulidixilakureruni.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/25815045487.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/sejixulel.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/12242696898.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/93365370398.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/tezufo.pdfIn PDF document text
    • http://keacg.com/upload/files/25904331892.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_9D86E44A556D8099.pdfIn PDF document text
    • https://panama4d.com/contents/files/zemugagup.pdfIn PDF document text
    • http://tradotel-riviera.com/file/natuwagilafanikozasi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/90d444ebe79f2fb8463c806cb4abeaa6/90868700797.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/23289643777.pdfIn PDF document text
    • http://rinsacars.com/files/others/70467178120.pdfIn PDF document text
    • http://vit-physio.de/file/kofuni.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/menimupomopijenowaroza.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede12a3ad9---81488460201.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/73036569254.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/jenexe.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/46100502341.pdfIn PDF document text
    • https://wmu24.ru/media/file/fosinifasetadidutotob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=avatar+the+last+airbender+full+movie+tamil+dubbed+downloadPDF 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_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 20640 bytes
SHA-256: ea603431f25f6f3050ec0e3acc388f69a8569f9883db2e5c77873935df8ec6af
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 10992 bytes
SHA-256: c85e8fa7336e162fa3113cd97a56247874efd150d3ee0cf9fb30c24f64b911ca

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