Malicious PDF — malware analysis report

Static analysis result for SHA-256 45461734e8f2c85f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 01:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4de8155815fe09480eb360a5a687583 SHA-1: 21cdecbb0fd40ed4730221802d59e4b977a0cdd9 SHA-256: 45461734e8f2c85f544ccaf8f89cf38961c5a3c93cd3b9bb5b1ae1a277e7da69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed as a lure, potentially for phishing or to download further payloads.

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 http://kubkao-kubpla.com/userfiles/files/lixorikanan.pdf In PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/66649836657.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/bazapezabag.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79271271035.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/65400687952.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xubovitiwubepowavej.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a30b9c578---jamubuzapowididozezuki.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/72781119212.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/95568423664.pdfIn PDF document text
    • http://orlickachata.cz/files/files/lawizulagesafukituwevojit.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/vadosidurowugumafer.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xunedojokuliralosufifo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7cb5781d4574c498e1024662cc93e411/popodapepar.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/dafujexexugowu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/bifafufunodefipe.pdfIn PDF document text
    • http://onelove.cz/file/87860690961.pdfIn PDF document text
    • http://egitara.com/upfiles/files/58074383568.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/lufesatinujop.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94072640475.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/wixonetojeba.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/fiteji.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/kidojegutifokove.pdfIn PDF document text
    • http://eichler-kammerer.de/72852181297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=master+reset+lg+optimus+l90PDF 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_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 10872 bytes
SHA-256: ef27c21b6cb54580e86f11615f6c0661563eb0d66e972189c4ceab6e1558ae56
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 18272 bytes
SHA-256: f1e719864d8bf7b12a97b0b1f790f6489a63dce7c8bb3de6ce7cb77411fac23b
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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