Malicious PDF — malware analysis report

Static analysis result for SHA-256 90229c51c3997aa6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 19:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98d2d25f8af0c615d1e5df134d58849d SHA-1: a4545e3d2171955c2b3b798ae167555f0de696cd SHA-256: 90229c51c3997aa673de115367e7ad2e373d6b81cf4fb8d8b6bd3151b341006f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating a browser extension installation lure. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. While no scripts were directly extracted, the nature of the lure suggests an attempt to exploit user trust to download and execute further malicious content, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bjerkelunden.org/content/files/userfiles/file///69072878473.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c1ba870ddfd944c9c370cf658863650/bawudutinabe.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/wovexo.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/newebunazefopodaleri.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/92716841784.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/36304019876.pdfIn PDF document text
    • https://kimcert.com/E/file/67436029915.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090714001173499.pdfIn PDF document text
    • http://elpijisystem.com/file/dudedozize.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jatefevomokijir.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/belevisudonasupewukawunix.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/kejeritazisuxufowusiloze.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/pesapubevebaw.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/butobidadaviju.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fuzozep.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/kujumogesarapakomaku.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/rexaranopexuvipekivope.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/53479444518.pdfIn PDF document text
    • http://ranch.pl/files/file/tazeziwijidajo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613034377289e---nesotak.pdfIn PDF document text
    • http://qwerty.pl/_data/file/dozeketikaraxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+block+play+store+adsPDF 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_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 17280 bytes
SHA-256: 9bb994eada9301ed1c1a946473c6360d42dd628858550794b0a843b146012689
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 10732 bytes
SHA-256: 43730173210278c43f6d230e3fefb55bb3d379d3677b8199ac7e5e078eae0838

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