Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a1613d20989ea2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-15 17:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e596fabf441277a5fb3ce9f8cd07ec0 SHA-1: 752853bcd0c06e9318f00a3decc96852901e1ca1 SHA-256: 99a1613d20989ea2a0fc740b46662b4b332e159a9cd2ef546957080a318a8dea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5fff0495fde5f16d99d6a52f7b4496a0/vuwoj.pdf In PDF document text
    • https://fallsplat.se/bildbank/file/56611594268.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/vafotokurerurorozitiwe.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/95288370461.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/gisuzutigegabiximepef.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/16842399478.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/lorodaladekikujetifeduwix.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/56187834131.pdfIn PDF document text
    • https://norservis.com/files/files/mamebu.pdfIn PDF document text
    • https://funke.be/data/file/79264662228.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/51214132448.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/74608359432.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/51085573425.pdfIn PDF document text
    • https://ip-pharma.net/data/files/99243704139.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rinomoporabuwisagutev.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/55385923479.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3827d8a2---wejomedepokixomobexexital.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/36141369829.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/sokiluxavuzukux.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/nupewavidekafof.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/tevedufesezofopabokotite.pdfIn PDF document text
    • http://vkts.se/userfiles/file/femixenodasub.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/90584820818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=soccer+heads+2018PDF 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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 17428 bytes
SHA-256: ed54bff6afad2b470fdeb2fc8bd41333dd5ba7ba4f293fc2d2228185f41bb47a
font_01_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10704 bytes
SHA-256: 7e247be208ee83a6c1d5d75a0ec1c76ce1db908eba8fc74235fe2b0cfcd45550
font_02_sfnt_off00013e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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