Malicious PDF — malware analysis report

Static analysis result for SHA-256 772942c852f4c9a8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-22 10:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5ff740ede55f754a98db3be7a7eea99 SHA-1: a2e2a7c4f70e052ef4519c4d3f8addaa1cb4c75f SHA-256: 772942c852f4c9a8b5165126c9bd46d03d8bdecc3549b39e36ad0287823b7e7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a second-stage payload. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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 http://bjerkelunden.org/content/files/userfiles/file///fanif.pdf In PDF document text
    • http://status-go.net/gfx/userfiles/files/sunobofefoxexe.pdfIn PDF document text
    • http://epmachine.ru/d/files/lakor.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/vebodo.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/xuxozurexikajugime.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210905202525.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vebikikemex.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/422f785e0a4e5a310baf3a451e116c71/pijebib.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sadunurolumit.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/bidokibo.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/foxatobesepofupimadaj.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/vivonesugidarovumek.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/vovapikekide.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904063708.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/15950182052.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/27797450268.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/81881589170.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/debob.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/nusitisoj.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/65688083443.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/ginudimazul.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e16f57ae59396a30fa44ad2234faf46c/gimuwexosel.pdfIn PDF document text
    • http://cloverdiamond.com/file/66365094793.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109201707419953.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/zelijoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fifty+shades+freed+pdf+free+downloadPDF 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_off0000b8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EE 10772 bytes
SHA-256: 5f8504d5c5f4c022a73ba185c3c48dc0f42f6b77a9a71477d1b3074580a72fc3
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16680 bytes
SHA-256: 38436aaa5c59318ff82a45e9676488070300d6cdd9d262ab9c1876a6a59e47fd
font_02_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1