Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5fe4a24860df5f…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 14:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9771cb8f01fa9c1ecf497e32a8691f68 SHA-1: 3c80ef593f94d66d189b8dc7d6090b27e1744d8c SHA-256: ef5fe4a24860df5f40d09b66eb57211525daefe5a5bcd3e4db3f535d5cdcde18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious content or further stages of an attack. While no scripts were directly extracted, the nature of the embedded URLs and the link farm structure strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://iwistw.com/upload/files/76267782859.pdf In PDF document text
    • https://brukspec.pl/upload/file/savogud.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/92603578432.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/53988855935.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/67767700478.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/81154576964.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zefitavosajasevibogive.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/vusojefutevan.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/274432796.pdfIn PDF document text
    • http://gaudi.tw/upload/file/49414906401.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xuvobopezi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpb7dkfaon2uoqttmqo2p96ka3/tisetexowejutavivumojok.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/labiv.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/lugivefipadukuwegote.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b80c8c2c4---rukafal.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/3859349285.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/savemibadebiwenadi.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/mekepifazekilalek.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kapotiwuzuzulazawo.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gifaj.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/30375528634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+z+super+season+1PDF 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_off0000ab7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7F 15432 bytes
SHA-256: 7fde7166b8f9fdaf0e143e1f6b7ab2f87b6d8f975e87131b956e04cdfbcc6107
font_01_sfnt_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 10592 bytes
SHA-256: 4cf1e9d82f4f43d0b60b6cfb8bbfaaed3c44c466c91415a2738b1011e31c11c9
font_02_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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