Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c7d52fb154f30…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 12:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26df4261bafbcd4f6c2b8f2dced54c3c SHA-1: 4507afbba1c211590791648d5ad48968bbec173a SHA-256: 0b9c7d52fb154f3011d873a4ea50adbc6b9ff40bb5e9a5d659d9e62b86e275fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated and unreadable, the presence of multiple external URIs and a high ML classifier score strongly suggest a phishing or redirection attempt. ClamAV detection further supports its malicious nature, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://braghieriarchitettura.com/userfiles/files/93130543037.pdf In PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/99611416311.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/4353128512.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/93449950523.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/regazejetiwusurivemegute.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nemerodudu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/lenujebed.pdfIn PDF document text
    • http://lejuriste.ru/files/file/menukawakefekapi.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/25400789265.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/numasituvaxolu.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_030944.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecfb0879c2---96500250581.pdfIn PDF document text
    • http://www.polni.si/Images/files/36214745.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nanavexitazubokoda.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/pojufufuw.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/puvexodokepakekekugojizo.pdfIn PDF document text
    • http://ping-property.com/user_img/files/68785440063.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/duxafaledarutepatagikeme.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/25033274566.pdfIn PDF document text
    • http://ahknchem.com/upload/files/67598732856.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/21535513876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+night+sky+app+androidPDF 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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10792 bytes
SHA-256: c2de49416d1e8d3431d32b230932411e4321157ecf95602292460e4d5d5c238e
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 17644 bytes
SHA-256: 370e08a038f636bf51a9072c73f3c83bdd7bc11759583767e7f0cb05ad4e831b
font_02_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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