Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65fba19e36931e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 03:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69f1f6c73e7f366956a4d94845313a34 SHA-1: 3022f88218fc889bff811144f4bb3acc49077248 SHA-256: d65fba19e36931e9a5003dd8239b3792fdc388987b20ac0a53ac53b0668afac7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or are used in link farms, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=keyword+relevancy+tool PDF link annotation
    • http://lepetitjaunais.com/userfiles/file/baposezuwekepirofuzemeb.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/sinazafejose.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/tezozibujito.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210908031616.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/lixijirotob.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/mugafanugav.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/tomitakek.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/toliwimimitedumebapip.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/99295041156.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/74893978802.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/bubafer.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/43289554139.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/xavimesisifulujofuxegore.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/pizisexadolu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/61873209981.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/fudorawumekezokumapokuge.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pubezeloxu.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210910010203.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401ffdb80fa---gosukowa.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/geravukizoniza.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/balonalodewaxoda.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/27450879342.pdfIn PDF document text
    • http://centromp.it/userfiles/files/98882401584.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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10360 bytes
SHA-256: 468590ff66b366b9229ee2751b973a594c530d73b23aedec951de76c1af53e48
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 17976 bytes
SHA-256: e876668be3b739e778d783729f57f740373335477a378839d1428d1561992e04

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