Malicious PDF — malware analysis report

Static analysis result for SHA-256 f235e09a1986dfcf…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 00:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 518872e25ebdc9ddcd138983ebea614d SHA-1: b4da1c9cc9f309a41093d24bf417d9b1ed1c673c SHA-256: f235e09a1986dfcfe505d3e0c67f5e113b7efdd4fd4a65ffa601526257ca4d19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a network of links on disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theshamrockpublecco.it/file/lurupabu.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d834d58443---85393310297.pdfIn PDF document text
    • http://wohntraumgmbh.at/16449222896.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/12573638689.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/gevune.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tekeluzixidara.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/32326118545.pdfIn PDF document text
    • http://sinners-party.de/media/file/xotuvepesatomigoz.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8b588026f10914a5e8f1a2b6b33ac3e7/vezuwiduvalifal.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/gebonuwutobaxisur.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/37553520001.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/30827056888.pdfIn PDF document text
    • https://interconformity.ro/images/file/gejevifodejusut.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/guzarulekewojeziwexede.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/bibal.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/sowedobagereruvew.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/58344687649.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/9796137200.pdfIn PDF document text
    • https://anup.bo/images/files/21057317877.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/8760773442.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/56255780053.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bazometedixuwanebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ringtones+maker+namePDF 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_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 10544 bytes
SHA-256: 618bf31541aa1072763f392a142bdb8d9a442e0451da7580bd4442044770864a
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 17156 bytes
SHA-256: 6b05694ca6cdb20cba6f350cf9e662de9dd0c5cb2680be5ea205fbf29ab36e9e
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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