Malicious PDF — malware analysis report

Static analysis result for SHA-256 228efc5d98206283…

MALICIOUS

PDF

90.4 KB Created: 2021-09-12 18:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4fdcc0cc9a11b0af6762d8efde1d483 SHA-1: 1d031856263cb60f0afaac8dd3e18d906b769d29 SHA-256: 228efc5d982062835d848af790e52ceef3f873a1997d19adde1459fc9c9df7d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/abd9dd29c08d845549c30b3fbba57b02/58708719307.pdf In PDF document text
    • http://trovas.com/userimages/23393000837.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/pokidovufarimonigofakobiv.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/91648498340.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901160913.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/13064562400.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/sivudagotapifexuzatak.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091021162663.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tupobefulifubon.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/pewaseparobanuredal.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/tutavux.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/29440411534.pdfIn PDF document text
    • http://castel.lu/userfiles/files/wugegugotejet.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/87682660240.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bemagesate.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/48090124868.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jibimilejevipizabojuzojod.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/divaxologovolijigijaresox.pdfIn PDF document text
    • http://unibox.lv/files/text/dujirogezamek.pdfIn PDF document text
    • https://tigapilar.com/upload/files/metefop.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/pisajupuvoditixudiwobupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=whatever+it+takes+full+movie+onlinePDF 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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10732 bytes
SHA-256: 61da394f39f206b8dbc3e3c7c1d0caa6db4c949f47456f366c166fccf6fa4c4a
font_01_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 17228 bytes
SHA-256: 1659a01b7e03354bb4317e7c0ba7bd5b3e788f6ff2765f4697224f05ce0c742d
font_02_sfnt_off00014413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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