Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53d546328c7d01b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 05:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bbe1ce6f2bf1cf7d61e061114eaffd21 SHA-1: fa8831d2a84465fb0a3525aecb94279a3a699bd0 SHA-256: e53d546328c7d01b0a47b2719255214f9583f46d882f5b0c2ab897bc11931b55
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=a+mind+for+numbers+how+to+excel+at+math+and+science+pdf PDF link annotation
    • https://godahoian.com/app/webroot/upload/files/41240963836.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/17278620686.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/masile.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/zavewulivimagekidoritu.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/lawakanefuxovijerakoxafe.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/54829545621.pdfIn PDF document text
    • https://inks.bg/userfiles/file/83703920580.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/jivig.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/32429905167.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/20850570800.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/44327070838.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/15196566257.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/kujajutog.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/kokomufedojuledujosa.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/tunilezonowidurowozejusat.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/filut.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nexalatulirufusosuje.pdfIn PDF document text
    • https://onlinendttraining.net/files/fedofarasifow.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5d36f051---97367202029.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/suniwo.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/wunimufaduj.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tupozara.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/71458640723.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/kejibivonisetemasaw.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/70672523834.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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 19568 bytes
SHA-256: 8ca1e3c8d99f8afa7b68df00a3e958ee8e39064f0b1908a65821bb7f79bd38f5
font_01_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 11296 bytes
SHA-256: 7ea67f2d48955fe5384d0b7578a9133405c1cb784c6aa31231c3cdec1307a3d5