Malicious PDF — malware analysis report

Static analysis result for SHA-256 d406932994632c23…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 00:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f516ec32472880db12b65d6982192650 SHA-1: 3cd5db484af9a0894602ffd833dbe81722643d34 SHA-256: d406932994632c2387ce901771af7c5a440e32908dc1d2bea975d3fff6afa96d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=up+in+the+air+full+movie+123 PDF link annotation
    • https://capitalsyndic.com/userfiles/file/nixujerepokuzudagoja.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/2662491885.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_F00692BDCE44E234.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wazizixetitag.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/regusejo.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/90779238010.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gawinubateboguna.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/pisulikuvozito.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/guvikeponiroj.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/91499243593.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e286d52f17f67b426a1f1efef4ed70ec/dinekokilerevivutel.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/fopamapiziwotovax.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kelufuzujigedaminarano.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/dufetorovi.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/fofajolekijasebonema.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/82400418045.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9d00ea2527e0f6a048658fe24dd69905/78076305692.pdfIn PDF document text
    • http://donghotam.com/luutru/files/68800553093.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/41705899859.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/mijorunekitogegixotononul.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///11983957102.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/luteninoduwizomudalet.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/55580517119.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 10972 bytes
SHA-256: ad0d23acf13e61c97538ff9e4893d4abc757e47a949efd19dc697559427bddfe
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 19592 bytes
SHA-256: b169be3f7d80601938d2ac95eba0c1c5bc157f49e764fe2c10545dfb2b305c6c

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