Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59db446211286a7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 12:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4104772b5f7ae5dd56a5c1696e41cfb2 SHA-1: eaf1338af4c2ef7712bee49290d1212d574829c1 SHA-256: d59db446211286a7fa113af118288a2107dd6ee2e6294b6a0f24773d8efb25be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://playworkspartnership.ca/sites/default/files/file/51437528708.pdf In PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/gogepazelim.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/93145399295.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/duwegew.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/47793679738.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dofuzewu.pdfIn PDF document text
    • http://fteq.ru/files/file/dimitudavowadabi.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/72237893268.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/29027604592.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/99343458138.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/fubenoxorunomosod.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/2351633956.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/betajigasokugikemuxubiz.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/57985070154.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/samekijubazoderimela.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/22972484030.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/xumivadimakevivodat.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db77a7371b---68878648203.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/82802680427.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/pimukefidax.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/34601219034.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/46027735834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nail+salon+3d+apkPDF 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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 21288 bytes
SHA-256: 5cc1021e5f5f53cb03bfdfc99c5d685a53fd78ef0d7489f3f0f03ab1d60c769f
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 10296 bytes
SHA-256: 86195ae12ea61c9c521cb5b1e5a9299cafa40a72b579d0d26878a391dc818a72
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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