Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b870013f90041c0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 03:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1db250aaa4e9122960dbb5b5ca61c11d SHA-1: 98dfcc7281b607cca30d36a98501fa420ce55074 SHA-256: 8b870013f90041c0960e1c63c7d7c790e2c5277544b5f72daadc323225d12c5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://apart1day.ru/file/8043874604.pdf In PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/rilex.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/85048873034.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/wigepuwided.pdfIn PDF document text
    • http://c-amc.com/upload/files/kunusiputipekexepi.pdfIn PDF document text
    • https://sadex.pl/fck/file/96303716301.pdfIn PDF document text
    • https://somogyplusz.hu/files/24704597769.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/67345963845.pdfIn PDF document text
    • https://biomisszio.hu/tmp/lusafufusodesovuwun.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/bumazamatebe.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210914171601545.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/nusafom.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/84865105957.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/xubila.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/36418314676.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/zajemuto.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/80460126782.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03413c04e---57169482612.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/nalame.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vivexirukan.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/laledanafejipupobumitonab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+share+my+android+screen+with+my+laptopPDF 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_off0000d0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 10968 bytes
SHA-256: f5a8c5d58ee072f4985dfe6540e51401a8f61868234539b8228e58e4bf2508f8
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 18172 bytes
SHA-256: de2e2b843cc714ad670d293f60a5d5998808371ac6fb2c3f0837618c28813905
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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