Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3717595a870ed0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 18:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f905960ac706320c4cb2f8d89e0992f5 SHA-1: dfde88551bc20fdf6f88b67cba2b1814df964f09 SHA-256: 1e3717595a870ed0b537107a107c683e9090648e11df742ee2c9a8d1ef638da7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains a high density of embedded links pointing to various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/20028114857.pdf In PDF document text
    • http://mardeestilos.es/fotos/file/nowopitodapibojifiruf.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/26116877687.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/92425317913.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/zevodureberako.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/5274353687.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/52586601063.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/17799745195.pdfIn PDF document text
    • http://glassick.com/userfiles/file/zemelusoditam.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/sobubepugomiwataz.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/22447326084.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/84871713012.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/92143028744.pdfIn PDF document text
    • http://camonetinternational.com/files/file/vitupijizowute.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zudupexajulo.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/14128736212.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6a89ed02546df92cb91f5013f291ab67/37653681971.pdfIn PDF document text
    • http://imbirimbir.ru/files/sexadibodoviduliruxez.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/dapumof.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/radofogiki.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ac8c2dc---18503691137.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/91788518804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+vice+city+android+cheats+gamekeyboardPDF 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_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 11224 bytes
SHA-256: 120347265e197c47213bdc5c372aadfdf285ec56ce5a2cc28223632f2708936b
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16348 bytes
SHA-256: 3af12e1d1d62a67eebc96cfc85c01a80e2996d998488a27187e4dc2ca79ba067
font_02_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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