Malicious PDF — malware analysis report

Static analysis result for SHA-256 3323b7dda883c0f0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-10 03:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed78d15af5a031bf93838d194893562b SHA-1: 2be980887a7e71e65715de35b824d4b653779a4e SHA-256: 3323b7dda883c0f029b04bd6a1797a7c86fbd1082bba2f961f652bf701d32ee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=ponnolathumbi+mp3+song+download PDF link annotation
    • http://kmsenior.org/file/files/gozetekazokune.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/wodijusorigowesegosi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/7966110968.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b0dfe11c463a2847aaed39f0a138d8fe/voxolebavarezijewusabi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///35507623500.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/25024816365.pdfIn PDF document text
    • http://centronegozi.com/public/jasawatomukuviruzimivit.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/somaxipudinugofe.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/49991661401.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/gelejitenigekokexef.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/20702172772.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/30936787906.pdfIn PDF document text
    • http://carbonelite.ru/file/23347631098.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/23690032274.pdfIn PDF document text
    • http://samtekelektrik.com/files/32355879255.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/fubepunemapa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • https://webmenuplus.com/images/file/88070980074.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/92713374452.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/tadudugen.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/22873515759.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/6526133981.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/rizakedofalalumosol.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901140613673557.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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 11104 bytes
SHA-256: d3ff1e6512b46c21ab21e6e01b68c82430e0047759d612d62139cf9cead2d8a1
font_02_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 15892 bytes
SHA-256: 0952f5a2554529fc8fc18816cc63d4b68d7a027521a06755369a680505b1d3b3

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