Malicious PDF — malware analysis report

Static analysis result for SHA-256 315ca7d3bb8d921d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 16:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 775bc5073b0564f2397944fe52fddc8f SHA-1: 2f5fca01e6e0b42768dfb6e676685799f65411f3 SHA-256: 315ca7d3bb8d921dd17d8e959ff97a7564426889702e54317d836a125b4f163e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=organizar+fotos+en+android PDF link annotation
    • http://gniortho.com/files/Upload/file/69425989386.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/77537952794.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/71802212508.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wutajolinuwakijalumera.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jefenumir.pdfIn PDF document text
    • https://atavio.ru/files/file/52202999456.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/fuxanebidopeforesa.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/86896381453.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/95759432198.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jamotetizane.pdfIn PDF document text
    • https://servicepapik.ro/files/94036530201.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/15035325410.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/20581351908.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/51729442690.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/8684324453.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/452055036.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/47885931822.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wuxosomefimefaxigelav.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/64473783889.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f576ece6---86845471813.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/xudojez.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/36113043019.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10568 bytes
SHA-256: f6a602b76acd505dab9657659006a94edd1fff0ca87ee7d6495f426b23e0b7b0
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 18972 bytes
SHA-256: f33501d4c18239e5063218edcaaef66731337e6c83c057ac3b363229a5aee855

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