Malicious PDF — malware analysis report

Static analysis result for SHA-256 32066ef0ad764fc2…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 22:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01e98dc154814c0b0378742b9cf6f4cd SHA-1: 9891f7ea5d6c86eab03838cb7e8fac0960e9ff13 SHA-256: 32066ef0ad764fc24c00367b80e2ae3eaf489e1938ef26c991db76db0fb5c050
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URIs pointing to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to redirect users to malicious sites, potentially for phishing or malware delivery. No scripts were extracted, but the presence of many external URLs suggests an attempt to lead the user to a compromised or malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://philabc.ru/uplcv?utm_term=stream+ant+man+and+the+wasp PDF link annotation
    • http://proxima-design.cz/files/file/gipifoxamugepudil.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/943606098.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/puxomilivuxujuzotunigik.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/58752827.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/54731932423.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50933386027.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/wefazesusagobo.pdfIn PDF document text
    • http://knipia.com/userfiles/file/81483226589.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lodiwifig.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/69111526990.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gabuso.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xuxifesaregumipenuj.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nidufu.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/75293994341.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/muluvedujijidovesu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05a5d0fb5---58272332047.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/doxerofowinijejo.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/warokejutamebiwefutuf.pdfIn PDF document text
    • https://stormester.no/files/file/97503811584.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/mewexenugimijudugipu.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/69754483208.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/28556863860.pdfIn PDF document text
    • 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_off0000acef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 10560 bytes
SHA-256: afc67e80f7fd4f16840b90510cfab18e5d6647126111a1c8c8424fbd79ef9d32
font_01_sfnt_off0000c4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 16040 bytes
SHA-256: a81ce2f6bcc4947413bae3cd3755ce5c92dbe0dec9069c05a1d38dd2d3c1fa4d

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