Malicious PDF — malware analysis report

Static analysis result for SHA-256 0570b58c88f58c81…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 02:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81730fd64803b77e0bd2604eedac94f1 SHA-1: bade990639738569cd23843304224baef3da373c SHA-256: 0570b58c88f58c81e6b178acfc59c6ed2c3ccb03151e78d3eeedc493cccf0f96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://jooli.ru/ckfinder/userfiles/files/xosurefakapesabozagemuv.pdf In PDF document text
    • http://atdawnwelift.com/userfiles/file/nedol.pdfIn PDF document text
    • https://allianztc.ro/files/file/28508942520.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/pugubunu.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/danikawuxevorapalives.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/xomejolalujapokibiwegane.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/25721223495.pdfIn PDF document text
    • http://teresachild.com/upload/files/senejamalo.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/21659667525.pdfIn PDF document text
    • http://allycatering.com/userfiles/36329286856.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/visiloba.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jiguwukedure.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/fezusok.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161301a5c68d11---linonoxagomaxolevixer.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gojeno.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79738797329.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bebibupolava.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/49054283248.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/88466731444.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/gexukagosivazezupupoxa.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/mulaziwejizegiduzameraviv.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxagalogogajo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613029f3e21e1---5250949742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=screen+resolution+apkPDF 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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 18208 bytes
SHA-256: 2beb87ea6e1ae25cabb85b280a8acc36e3720f1c3ffcbe77d55c9c54ab03c285
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 10636 bytes
SHA-256: 19ece5cb7af234a80d05f18e6ec3005051c1fa7ab0da73dd1a33b20027d48e6a
font_02_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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