Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce66f594beed2b9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 05:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9573192363a019f05f39fc41b31efb42 SHA-1: 489e2e53d1a0eba9640c4bfc405e96c98d2c9dc2 SHA-256: 5ce66f594beed2b92ea3d79fdef9c2c320d055ec7447660cb84d6ca3e42e1387
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a strong indicator of malicious intent, likely to redirect the user to external resources. The presence of numerous links to PDF files hosted on various domains, many of which are unknown or suspicious, suggests a link farm designed to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://taemyung.com/data/upload/file/xesijumiv.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/dufawiriwape.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143448aaab0d---62321407305.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/20056947366.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/44758548699.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/91429178413.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/mazigexozobiwekagazeledit.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/10537809878.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/23146716336.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/vaviseg.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88351460712.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/32654911232.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/wolukewawajuv.pdfIn PDF document text
    • http://pasaru.com/upload/files/jipuvasatudezagakesotiv.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/27078375426.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/mujezotojifadu.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/xisukojegimurepisagason.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/3339014497.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/narerusifanototexekor.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/78983735376.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/novewejugesomebizesevaw.pdfIn PDF document text
    • https://polytex.de/sites/default/files/nelerudinefegafugubogit.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/96795994839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=snaptube+music+and+video+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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 17424 bytes
SHA-256: a95b02110d11540aa45c0b3d2359d7ad3455feee5b245afcd765e55da01a9630
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 11040 bytes
SHA-256: f897cb2136bd7bddbdcdf6ec3697efb890fa792d770117c498bf4ff853f8fd3b