Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2d1701923b0949…

MALICIOUS

PDF

67.9 KB Created: 2021-10-04 07:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccd4f4dff94ce9303c97febfd05d943f SHA-1: 3d57ea0ac83c14bdf27827dacd0c5eada7b1cf18 SHA-256: 1e2d1701923b094985a9aa375e01a4d0255d81f27a0817d4d9fc402ff999b042
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured with UTM parameters, strongly suggests a phishing or link-farming operation. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=growth+mindset+and+learning PDF link annotation
    • http://diamant-x.sk/UserFiles/file/98390960109.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/14030540551.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/38979446253.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/080524081696.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/pavikoxememowosar.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/xejuserakifilupujitixami.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gasevi.pdfIn PDF document text
    • http://ned.ru/uploads/files/41983842430.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/97254426552.pdfIn PDF document text
    • http://dobermanncz.eu/files/vixizesikejije.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/kopinuderolodom.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nixewedagejoxinojama.pdfIn PDF document text
    • https://projetovm.com/uploads/files/53848534147.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/12661405210.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/9431928958.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99486715047.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/mamodogoxenu.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/48770635816.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090218562651.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/22842526227.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/nagoxofalapiwejosadenesi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6621d15f9---ridexetizaruvu.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_off0000ad6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6F 14432 bytes
SHA-256: 71575ace662ca187876c1bc6fcab2fcb24e5907253b84ee7d6cc8e6fb9d46601
font_01_sfnt_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 10820 bytes
SHA-256: 6c62e9f56f1a2d31ebbcfe353e6b588d4ca7185184a592956efee066e68a4ccb

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