Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d20a95453ec8bd4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 17:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3086c62c78fe81b5a19170c0ace82855 SHA-1: e753fbde21d09518aedac3e2a42c9b093f7ce5f1 SHA-256: 6d20a95453ec8bd4050bdb8ad23aabbcc553565fee02432e4ae9a38600705391
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous 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 embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=amazon+firestick+storage+full PDF link annotation
    • https://larrialdiak.es/files/galeria/files/55112271166.pdfIn PDF document text
    • https://hojoairport.com/images/file/57951226002.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/vazesebidorasekudov.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d00d68493251f7511810237df3177ca5/kitusudinabefo.pdfIn PDF document text
    • https://5uempat.com/contents/files/lidexid.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/39285267235.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/76545898007.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vkgd4pg9pme6evkshr90e99om6/59225892080.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mimumada.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/99546518406.pdfIn PDF document text
    • https://mcrlclient.gilcom.ro/ckfinder/userfiles/files/90688463173.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/fibajagukuxat.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/lofezi.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/85660868289.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/17419423341.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210912_15FA964832334A1D.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/xegixivosanisosepo.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/68269792343.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/79218224759.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/kuboteronugexarenipunit.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gelejaponesorixenalina.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210912_E900E7AF6017244B.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/dexod.pdfIn PDF document text
    • 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10912 bytes
SHA-256: 244626b0d7a7dcdb80a3e0631e466f3bbb7614a66227819a481960ef6c9d94ba
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 18120 bytes
SHA-256: 5186b3eb51f895ef30cc757f2d78caeb0640b126d0f6a3979b629af1a8ef90c7

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