Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de644dba8e2d334…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 23:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c052f650312a9d0509360baae8bffbb0 SHA-1: 1098546e42f3f61e543cc5883419e122706f9575 SHA-256: 6de644dba8e2d3349b5c4e32166043b98673af3ffdef189f87babc796bd22555
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to a link farm on disposable hosting, suggests the document is designed to redirect users to malicious sites. The primary attack pattern observed is the use of a PDF as a lure to facilitate phishing or malware distribution.

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 https://pixomot.ru/uplcv?utm_term=simple+contacts+android PDF link annotation
    • http://embeddedhr.com/ckfinder/userfiles/files/22143086268.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/5609898377.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fujutepuzalowupugikuteg.pdfIn PDF document text
    • http://chamdure.com/DATA/files/lelerozitadunib.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d05dec4f094380fbac3b08f495dbaf5c/24845298597.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/12148858508.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/zomobererurefamilubevep.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/busokipu.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fowefibiwirutobegalazuku.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/61979467023.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0a62d6a5---dimagagexiv.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/17997494609.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/72498996976.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/wogobagibiwutufofas.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/xozugunijavexos.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/49303275024.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/zisatezi.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/naxevurutivitoderetemo.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/79527675373.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xiwazafaliwa.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/butajefa.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/noxadunubexuzefotapifu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dimexowojavelajuwizinit.pdfIn PDF document text
    • 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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 17024 bytes
SHA-256: cad0db4b9750d61ea9d78cdf815e4e21bb6c1a35d658cee2ad5e7326f92e992b
font_01_sfnt_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10752 bytes
SHA-256: ebbae453433d7710e4b4760593ad1cd599951209646dce52b8134bddeeaf6595
font_02_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1