Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ec1518de243fe0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 11:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 849cb7d28a6867a9e1d5aa6ea6ac372c SHA-1: c391b4385a3e37644ade97904f585dbe3a4d4f8d SHA-256: 83ec1518de243fe0957124dc77e0be2cf82e1858ca3be9f754d914e780a80654
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://epoptavky.com/is/images/FCKeditor/File/zajixavo.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fowuvinojavamo.pdfIn PDF document text
    • https://bdata.vn/upload/files/xavomevejusi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d2bc4043---pedarajel.pdfIn PDF document text
    • http://glassick.com/userfiles/file/tasetofudukozemo.pdfIn PDF document text
    • https://dafelia.com/files/zufakuxipobelirukimejar.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/nolimifonasiwixebi.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/49663778753.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bodexevapomomunilotijogez.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/lipavawo.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/farab.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/3986061046.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/pegetenumopetuj.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/dagogodorenadov.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/petivibepuluzarox.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/wakamizad.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/gaferadefedofotubone.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/gusabiwibanazo.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/63583899010.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/senagibi.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/kowazexolosinajometok.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/3394721914.pdfIn PDF document text
    • http://ledins.lv/cms/file/87447950431.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/3407599583.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb69af4cd66c2579c6bf2d55a9a285e2/xisuzepazurujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=new+delhi+date+and+timePDF 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_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 10188 bytes
SHA-256: bbf6957b8e2f40bdca7c2f69293c9a9db5174cf83a1c06ab525dd3fb387b0afc
font_01_sfnt_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 17132 bytes
SHA-256: 4866630308d3da7632c3c2468103d0f6944b9101954d48c25c0a689ad19d76b6