Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e18198786e4441…

MALICIOUS

PDF

93.0 KB Created: 2021-02-28 16:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6cc53529dba4015654f8e8fa388a96f6 SHA-1: 82cafcd9fac16108fb2038dfcbb93249b13e8af7 SHA-256: 95e18198786e44418afa447dbe988997b7fc92b188ab9f01afe61e2d1948e74c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/strik?utm_term=all+accounting+terms+and+definitions PDF link annotation
    • https://cdn.sqhk.co/gixixutiji/ogfib7C/zibakajovibixabojefaxal.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/bRlCjbV/free_robux_obby_september_2020.pdfIn PDF document text
    • http://it50disconto.info/rafegofonanivosugexow651p.pdfIn PDF document text
    • http://tehnikator.ru/ritual_de_exorcismoftlri.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/9u1ENid/sword_makers_in_japan.pdfIn PDF document text
    • http://emmetrix.net/elantra_ad_service_manualnfxqa.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/o5JHyia/xotapudebabaloruxinokep.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/wlhingd/dig_2_china_free_download.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/guzopakufusexefofujedasid.pdfIn PDF document text
    • http://henrysavbr.site/fujanefijebidikegegdsbxn.pdfIn PDF document text
    • http://zixosoliga.iblogger.org/bursted_wood_primary_school_ofsted_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tutivute.epizy.com/59214243461.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/15499068160.pdfIn PDF document text
    • http://bejofidexi.epizy.com/formule_excel_calcul_d_un_pourcentage.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/42490594871.pdfIn PDF document text
    • http://fonumelipo.rf.gd/poster_design_templates_free_psd.pdfIn PDF document text
    • http://vorenetizufumuj.rf.gd/vevelotopobez.pdfIn PDF document text
    • http://poluwusafoge.epizy.com/98218668619.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/bijofubukujewem.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 5328 bytes
SHA-256: 34ba513a06513254e4ee1e16fdbccc5eefd5ca82cb01a9a10221dd8711ad05b9
font_01_sfnt_off00014005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 11400 bytes
SHA-256: 8231bf9fac6615cd482b76d68b83cd6a32e2cf384435e9d874e62c17cc609206