Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3a681493655cb7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 21:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3ab10938c208afbdb4d8081c170537cd SHA-1: af3fd3ba7934c197cfb9a3bcc1882da23e8c8286 SHA-256: 5c3a681493655cb73f498df846ba93288c00b73c94101b0970c23a6a48bb3a68
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution tactic by hosting many links on disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/49466536468.pdf In PDF document text
    • https://tidurmalam2.com/contents/files/mafedelinerus.pdfIn PDF document text
    • https://davnosti.ru/upload/subojomu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/faradepigudizalanen.pdfIn PDF document text
    • https://actor-conseil.com/files/file/gonefajesiz.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/wopixajadagojupekalawo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/legevofofekog.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/27933923918.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/63687535890.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xegelo.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/30582849000.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/kagujegubag.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/tuluxujex.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/55182993452.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/76189919516.pdfIn PDF document text
    • https://curvy.tw/upload/files/68643145800.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/nawidobasetasekazovifi.pdfIn PDF document text
    • https://suruburi.net/mm/file/lijupeb.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/86953860418.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/timunakifizebatogakuluxu.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/vexafewisafimesal.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/24927931022.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/3664777024.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/29787114126.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/dewewoxuluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vidmate+download+2017+free+downloadPDF 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_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 10744 bytes
SHA-256: 2bc23d8a5804ba046c1b742ed8382c570de1218e74357912222696921a93c5f3
font_02_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16024 bytes
SHA-256: 87a553806c5edac4f84c0e7bd65fe764fe390ad07d4b8187b6209e6ad9bd5fda