Malicious PDF — malware analysis report

Static analysis result for SHA-256 698b07e711d14880…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b9d706673cc0c015ee1463883cb3009 SHA-1: aac299b91bd7e49d989b40521a09ab841a00d1eb SHA-256: 698b07e711d14880ba0472888684bf5b3846de49f2bbac0d1cea4b4e8ff88a5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of redirecting users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://monamifrance.com/FileData/ckfinder/files/20210901_53F379A59631D732.pdf In PDF document text
    • http://ever-pioneer.com/upload/files/mukavuzajozumejadere.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fowojasirisurenifogifowaw.pdfIn PDF document text
    • http://anpo.vn/upload/files/52504705698.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/sovoguwineke.pdfIn PDF document text
    • http://akademibt.com/resimler/files/21798362885.pdfIn PDF document text
    • https://binhvi.com/upload/files/medakijaka.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kugejovir.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/tutemukejoxunagebafus.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/wanofenakigizezer.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/kimeviwadojudaje.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/72128769158.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6975d84a3---62960658874.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210913_47029DE3BDD0CE57.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/23877660558.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/10572516750.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d2c4d16492654b7bbf9e96ee72c96f05/58262821038.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/27253520975.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/25044035875.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/vadarigemupu.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/40039144647.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/ponodadefizidatadimek.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/zexurepawinelasabom.pdfIn PDF document text
    • http://woykoff.hu/upload/file/mufuxuvepozora.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sokedifutuzavuxorap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+amazon+prime+on+android+tabletPDF 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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 17748 bytes
SHA-256: 7a4da94535773d375bb6ce94149079fa81e8c88fa6c1ad04701ef6f7fb44245e
font_02_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 10804 bytes
SHA-256: 5340526de259e7f23a98994a54392cfb5f4451df187397f848508c19a26c310a

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