Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ac3fbb8df3af26…

MALICIOUS

PDF

69.8 KB Created: 2021-10-07 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f357922aba3b2963d086409f40f6dc61 SHA-1: 808e8bf2c638467b9cfc0a45d0b38b1486db5c86 SHA-256: 02ac3fbb8df3af2654283dc898d4e2b19b8305a418f719d013115c7b885f9be4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sogelec-eng.com/files/ckfinder/files/855613008.pdf In PDF document text
    • http://maslag.eu/userfiles/file/66994436906.pdfIn PDF document text
    • https://semut73.com/contents/files/98396585048.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/82312281321.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/3543912178.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/mamatado.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/zofiroteruzuwukalavuribi.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99389189552.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/lilanukuzetopele.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/fomemagewadujubarapeko.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/kokutigugavalitid.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480c1fb5a87---55785334577.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/12845699590.pdfIn PDF document text
    • http://przybyszewski.org/image/file/pefewijotalixeradimuf.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/topijikofe.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0258a10c2125a3e1b87b94aa50eb4014/43425265439.pdfIn PDF document text
    • http://gdgom.com/upload/file/210912135040646988lg87gphpcjt8.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/87073744589.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/98216539289.pdfIn PDF document text
    • http://kme-kme.cz/files/file/90783628215.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109050830294587.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/mexawiliximuzax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+recovery+onlinePDF 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_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 10224 bytes
SHA-256: 96d2519e9864d26358abb5b24f97db6eb1797076095863093051c719a939b7a3
font_01_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16068 bytes
SHA-256: daa60827fb44bb02b30086decc926521425865f4b824277f4ef89e63b918ee6f
font_02_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1