Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c9b6c3009e5734…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10644b74c2b427fcd83c3a332711ad05 SHA-1: 8e13d917333da4059c4a344c5b6ca49a87b376ef SHA-256: 66c9b6c3009e5734f511bcec992865d81201726f9eee0a60f185408fa2630f33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were directly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vishalahospitality.com/ckfinder/userfiles/files/zanigamupolevegi.pdf In PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/25520553374.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210907150025.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/sunex.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/80146691014.pdfIn PDF document text
    • https://mlspoland.co/files/file/munaso.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/rimidafuwo.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/somegolukinibo.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/79075586439.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109122107586328.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/valel.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/7373155880.pdfIn PDF document text
    • https://robertbah.si/files/file/64520517372.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913171707.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161378f7bc7128---56546905815.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///21432268908.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_100306.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/74336148878.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50081735403.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/43592758306.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/lesorikupepozinafiri.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kefepolururupetisebiraluv.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wududox.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/67189279649.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0ce514518---ziremive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asi+market+apkPDF 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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 10216 bytes
SHA-256: d822d869568d764ba5f44e1c236bfb618f50e7c689760f8fe8ea44c67540d77d
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 17716 bytes
SHA-256: 9ecad126ef4c009d092396cbf0c57ccf5d38b156aabbf3b6834809e425c1b9b2