Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e61863c1223e19…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 23:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c28630beced9d13c3f6be2a5c1112365 SHA-1: eea5e310a4e90fe4e563fb3771be6b5cbf860315 SHA-256: f6e61863c1223e19179d696c554ca2743c2319419a49c2e0609ff95aacdb20b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://danchrisjewelry.com/userfiles/file/benavasimuva.pdf In PDF document text
    • http://lidaoxc.com/upload/files/niturinokogoridonuris.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b1f908fd4797ab5332f6ad872739be41/tonuwu.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/35983182408.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/dirinofizikog.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/55037325473.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zazawexupibumaputad.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/28297544582.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/fobibalejifijeralu.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/14073750808.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/temovoxizotebabun.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/49396999601.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/72979262189.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zitinodumagavepelamomis.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/23700347241.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fapem.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/tunubivebekala.pdfIn PDF document text
    • http://firegallery.ru/img/upload/80813349203.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/97262797171.pdfIn PDF document text
    • http://novichiha.ru/pic/file/zilijarev.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/57735835894.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/gadonadix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=harry+potter+and+the+deathly+hallows+downloadPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 17368 bytes
SHA-256: 5f81d722bf3c7335ec7bc67638172de5fb2c5148499fe2d3cdf820af5818dabd
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10588 bytes
SHA-256: bf58a40b7cd3b581011fc9c2f897516dc50b9e9dc05f9a5825ca8b78c8763053
font_02_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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