Malicious PDF — malware analysis report

Static analysis result for SHA-256 624be6e68eef6c2a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 13:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4819a7a2b20ae5a343d53f58454e1e4 SHA-1: ca2ac231f1c714c3f9b7e13adfc3c0457f4f0685 SHA-256: 624be6e68eef6c2a59b8f83be5d9b8b4db6dea723c1162fec2b04c7dfd53a14d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huaku3c.tw/uploads/files/202109071257524901.pdf In PDF document text
    • http://skybuildinfraprojects.com/uploads/9662199736.pdfIn PDF document text
    • https://breedlife.com/upload/files/40761157419.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/93566786496.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/15328220930.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tulonufobi.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/xefeba.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/47186628739.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/gewugawenatu.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/88575978558.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/83675811365.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/1238198766.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/lixaroru.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/vuxapodabotamo.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/penubipusepeg.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/sokozixolo.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/rimivebisus.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/33892795631.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/luzamudinixezok.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143326e5bc3f---84746803995.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339a79d39d3---88615421024.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/motozu.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/pabunasigeti.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wezawaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=solutions+incropera+7th+editionPDF 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_off0000c20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 17096 bytes
SHA-256: e6e703c6317611c4a8d82179b8acf7a8039aedf68adf343782788ae34ed411e1
font_02_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10836 bytes
SHA-256: 539ec4a4bad393886f2332c27df243727f136a53ec2e243fc892254373d7d567

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