Malicious PDF — malware analysis report

Static analysis result for SHA-256 430a488ab73f7299…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 17:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d63810541a450dacd0db49d09d8bf709 SHA-1: 59f4b75cd63e0adf90b0227d60dde3a090a14c39 SHA-256: 430a488ab73f7299d0516d4b2963c44e344592dee4b13fa1f6d86ac9809cf86f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=mms+app+android
    • https://ewastexperts.com/userfiles/files/60396156752.pdf
    • https://loyd.rs/images/file/kudenub.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/rojobolokuxekonibabazadi.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3edc989ed---98317996299.pdf
    • http://campingwithconvenience.com/files/files/lisajudinunad.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/majajolegobajit.pdf
    • https://fishboat.hr/files/45875869710.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nogosaripa.pdf
    • https://heritran.vn/uploads/news_file/93625216775.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416521452ad---pezamaxiwat.pdf
    • http://soupworld.de/upload/file/mefizenulelam.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/41152466258.pdf
    • http://homokkepek.hu/editor_up/67266966383.pdf
    • https://questyme.ca/userfiles/file/47200427999.pdf
    • http://hydrogears.com/survey/userfiles/files/viselugawoxaxinekoxarez.pdf
    • http://citra.cl/userfiles/file/94203577258.pdf
    • http://dsagco.com/Upload/file/mamekepolalorimunorafigi.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/sazexegoxasaminumixumu.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/povogepiwip.pdf
    • http://wx-test.com/upload/ckimg/files/202109151817385426.pdf
    • https://jung-yeunjang.ch/userfiles/file/pekasowutenovovebagur.pdf
    • http://milkyway-vn.com/upload/files/nurot.pdf
    • http://narzedziascierne.eu/Upload/file/767159858.pdf
    • https://shellserva.nl/docs/Image/file/puvum.pdf
    • http://coolbiotech.com/upload/files/geliju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 16792 bytes
font_01_sfnt_off00010312.bin
4bbfb992bb44df1f7132e9939c00ef337852b8c05bdf6c28a895cb087face7fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10272 bytes
font_02_sfnt_off00011a05.bin
b39b431151c63f7656a6660151742e6796e4f3c03e2e65caa1b2b075e5916c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 17180 bytes

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