Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f6b8c6c18a2f47…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 00:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce326bef8128f47d0079e1d5a9777d01 SHA-1: 409b1b51067e7d32d3303845b851275f065ebdcd SHA-256: 57f6b8c6c18a2f47ad48fb539d726e5a474b5d6f94c2c49a037ff404f0603608
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=an+affair+to+remember+full+movie+123movies PDF link annotation
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/xalaju.pdfIn PDF document text
    • https://majubesar.org/contents/files/9209275091.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/verirodag.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/46092143760.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/zapawa.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/zolasataxas.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/xaxojigukibarus.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/86076435660.pdfIn PDF document text
    • http://ustunongel.com/image/files/xerivibasusumebilevuwijuk.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/11358949398.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/delarodozagatokewugubaza.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xukezejemadenunogakun.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/dutesojofizumuvi.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/51958788223.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c62458421e17618194eace2d90fcc231/91563823098.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/609b40ea4ad7ba533b9b3f60d82775d1/33941315581.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/18767508182.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/jewozofowudiligixegaju.pdfIn PDF document text
    • http://ned.ru/uploads/files/88064656357.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/naxenuze.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/82427375806.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wogabuginokomar.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/roruniv.pdfIn PDF document text
    • http://kbchina.de/upload/78068472337.pdfIn PDF document text
    • http://boldogelet.hu/media/52860146884.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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 17248 bytes
SHA-256: 90626c753e244a1859bed6cdc05fba4c6fb4aeebcb9c7b880b732a1b79671946
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 11008 bytes
SHA-256: 773897dab8a5482ce5e4816d43b35ea8b0fa73e19511ca93533abd05048fadc3
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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