Malicious PDF — malware analysis report

Static analysis result for SHA-256 760f370b37e3d3b7…

MALICIOUS

PDF

83.9 KB Created: 2021-10-10 10:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2a320d6893e468cae91738a0705f164c SHA-1: 1f513b839a1ddd9d756d3b1db2eb1f2e35faa9ed SHA-256: 760f370b37e3d3b7bfdeb4cc07a9b706fb9fda6f3aa715d41d7c8193e0d1ec14
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to obscure the true destination, likely a phishing site or a download server. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wiskind.com/filespath/files/20210912071347.pdf In PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/linobapok.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/71163658510.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/tedoroxakewos.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gigolijalijananuj.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/18598892874.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/beminapegoga.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904193101.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/vazexisipavebapixe.pdfIn PDF document text
    • http://fialki.su/lavafimu.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/12305410423.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/2254866813.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23269676416.pdfIn PDF document text
    • http://fuoriscena.eu/file/liviferijep.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/kulofaviginidonobafuxi.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/vezivi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/tosutunovikodorujisol.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/dirinurokiwas.pdfIn PDF document text
    • https://artbynela.com/uploads/file/matakenobifuwim.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/zimikarilitu.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/potijezotixur.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/32058680478.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011811384225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+was+the+case+of+marbury+v+madison+aboutPDF 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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 11192 bytes
SHA-256: db9594b1d711f3a7b3cce81b508c2549ade4d190e629e19531027b06c7f69b93
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 19624 bytes
SHA-256: 5cf61dd183c5fa29de8073bc43e5b21082208c6d0a72e8db4a726cd7f98a9f8f

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