Malicious PDF — malware analysis report

Static analysis result for SHA-256 6185675ecb6a1dd1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 20:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 508f4033c1fbbaf2c76692e6e03a6e68 SHA-1: 6a4d4e764d5287311e0511d88b5c47115493db12 SHA-256: 6185675ecb6a1dd1481020a374cc8e83654dcb40273b138a55f0c22196b436e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to exploit users by redirecting them to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://dienlanhhonganh.com/images/pic/file/16514359835.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebc3a8dc5---befagebe.pdfIn PDF document text
    • https://festacontinua.it/public/file/9606314058.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/64479085986.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/155143361361373aeddd898.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nimexoluruzega.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/vakipupokabogilixiki.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/mutaputuradikogopifem.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/tadoxik.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108311916058182.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/maniwelunujewikizu.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lekusuzojaxuz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/rokodinebojuzuke.pdfIn PDF document text
    • https://bunianco.com/other_files/File/tedimiz.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/jaguvutaveselelo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wewenitopisaka.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/98493591978.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36811793060.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384c09cb2fb---1586095747.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zawurorufutuxuf.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/53550888478.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/68988001996.pdfIn PDF document text
    • http://e-menu.hu/editor_up/zesasivitutijojuxo.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zukabax.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/16420419809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fusionner+2+pdf+a4+en+1+a3PDF 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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 10848 bytes
SHA-256: 2e0c04f855873b34e8148fdd0556fabbc186acd3d63d69b4316b102e2dbbd08b
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 19760 bytes
SHA-256: 5b136df6024197dfe2f966a37ce9d4dc619dbd595af23b56a89a544db1dadb4b

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