Malicious PDF — malware analysis report

Static analysis result for SHA-256 510b7a0095994ea9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 13:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 882ce724de324a32c8fb44c34a5675e6 SHA-1: ff206350115f412f2d64681ac550ac903f92486a SHA-256: 510b7a0095994ea9c2cbcae4267e9862ecc6388c8c695ea8922182a9c5edbf9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior, suggesting a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=electromagnetic+spectrum+energy+range PDF link annotation
    • https://testgit.begurholidays.com/uploads/userfiles/files/94654421163.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/6962716099.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/ligomabenamukuzidatumif.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/23621476650.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/99388788393.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/feparojonu.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/72697584729.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/muvotigut.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/38360698686.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/dupuj.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/keweluzuvijomokax.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/novezezezef.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/dogesukivek.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/wagajavixi.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/87063092225.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/zagobifupabuf.pdfIn PDF document text
    • http://classtool.info/upload/files/fademepepopitoje.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/luvanodo.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/fowigurukonuzevenupi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4b614e4---bosevaza.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/vuvupusisunetomisadomazas.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fuvipedipumalupanuxonu.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/83474999980.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/basobowe.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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 10916 bytes
SHA-256: 4542abb3adc2c5ef689c3cf7ecea3fa27a9b8349a428ed31920304bbbd96e475
font_02_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 17956 bytes
SHA-256: 00878617ac4ae2fdcb5cf0cd2599aeac0e3a40a4458025d929bac675c9e3c69d

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