Malicious PDF — malware analysis report

Static analysis result for SHA-256 5046ca027c39a777…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 01:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fab3e9980278827418ed461743f31b31 SHA-1: d5cd52822523c2cbbaf7c0f3e8c089c22d3c4bec SHA-256: 5046ca027c39a7779ec09feb747cb4a47791cca5cbad83fe5f06414e8e5d82d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to a URL containing 'aplicacion yahoo mail para android', suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm designed to redirect users, likely to a malicious site or for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=aplicacion+yahoo+mail+para+android PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/bunirevulogaropumuxiratu.pdfIn PDF document text
    • https://guijek.com/userfiles/file/43508218159.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c838a2dd---gavefimutivazabomela.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/litasibasakodofitukatuni.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/fizokejozusoxogugubix.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/7320428569.pdfIn PDF document text
    • https://parkettworld.com/upload/files/ladegekavajikemaximilew.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/22970664216.pdfIn PDF document text
    • https://foulardfotografando.it/file/70936482073.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/847a1622d4c16093f0c9eb6cda51abc1/ribizi.pdfIn PDF document text
    • http://shopabrang.com/images/files/94120431550.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vowinevagamikowozeniki.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/2160651156.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/81621725720.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/sivazimitatawakoniga.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/54436407915.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizinupimiridafos.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/zafigixejugafipetuwevu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nirevezigoxisurisodof.pdfIn PDF document text
    • https://rm-parketi.si/uploads/niros.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/dexetidomojofavotisej.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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 10476 bytes
SHA-256: 853c8590f8e94b87bcd6c28f1171fbddb18eed67f0de6d5f728fea8fb1d68bdd
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 18360 bytes
SHA-256: d1a8b90df824f53b4b0f13725e8c5decad8fb7c658915bab43cf831d423250e4
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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