Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f031c2878abcf3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 23:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6f4cbded377cb836782d0cfcadba34f SHA-1: 83882072b0eccd2848cc13260b010b9d92289adc SHA-256: 18f031c2878abcf39173e15bea1f053406a550f2c3e54a843998473f15887b1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also includes numerous external URIs, many of which point to potentially compromised or malicious domains, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ttmplus.com/userfiles/files/nikafa.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798a58f7f6---tifekagakexamem.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/87797849160.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/vanulorojegilevozataxozik.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913021658.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/buzodozijag.pdfIn PDF document text
    • https://riwg.in/userfiles/file/gigixotu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/budotetibelunuz.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/gajakozupopoj.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161365182311f7---24670069071.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109141812498992.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jalujukike.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/gogogisalekod.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/59861396299.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/35513808180.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/sevukolubediwemapipekolo.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/5854488715.pdfIn PDF document text
    • https://hsse.cl/files/jixifuluz.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/gebogotowiwusazojom.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/63479917014.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/57086271809.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-11-12-27-06-20.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lumagijima.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bosarimotefexotutuvos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+track+how+much+time+you+spend+on+your+phonePDF 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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 17924 bytes
SHA-256: 870047bf9d44c8d464afc47822fd05bb71ca38381a44064115f819758c82178b
font_02_sfnt_off00012cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB9 11116 bytes
SHA-256: fe7e0a8507132457ecea69347555bbe9702cc13f5f6438ee789476e0b0e015e4