Malicious PDF — malware analysis report

Static analysis result for SHA-256 535219faca89ae81…

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 06:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7b1a188365c05f1654da7fcff722bd6 SHA-1: 4fa2eb5e85ba389be0125eedfed594c6f61a37c1 SHA-256: 535219faca89ae813a3be6c00f2c5f704c7e36bc795dfea36ad1f1a25113b81d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The numerous external URLs, including one pointing to a PDF file on a potentially compromised site, reinforce this assessment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=phrases+about+thinking PDF link annotation
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/lapalejafogametepapave.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/48623106130.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/goredobixaroxusizeso.pdfIn PDF document text
    • http://ccsl.asia/files/52816420129.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/91613894788.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/46782887043.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/muvunejim.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/29908747326.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fogev.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/78753827282.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161479e5137f40---41131819695.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/gexotanubobuxupikedivisim.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/sixomatuladewugunoxo.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/64616414038.pdfIn PDF document text
    • https://inmasa.com/imatges/file/56827593604.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/53778381232.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/sumatanava.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/golomivafixufivaxopasi.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/zapenadu.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/33069539633.pdfIn PDF document text
    • http://princeverma.in/uploads/files/razovogetomaki.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/titutawubevoropawujub.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dupebatimeseruto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bc5b3c984---xusenorejijuboga.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/47794721515.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_off0000b30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30A 10676 bytes
SHA-256: 715a0dc3ee1677b74ffa67cc567e5a37e3e831e82e6c8d984b99a1b27807bb0c
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 17364 bytes
SHA-256: a13c1c6255d48e4987a1d81dc85ab259d6fa79fc26ff156bc4c01c1c6916a31d