Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e939de62a3dd692…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 17:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a311d4032e1c93e1fb781aa292c7d94 SHA-1: dd40382fbb07e64b4c471ff00a8485bb9046e4f2 SHA-256: 7e939de62a3dd6925faf38ae12b5752b88c50a4b5d5a0e7f15082db5540b066d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which are part of a link farm, suggests an attempt to redirect users to malicious sites. The primary URL, 'https://crewmak.ru/uplcv?utm_term=activate+office+365+offline', indicates a lure related to software activation.

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://crewmak.ru/uplcv?utm_term=activate+office+365+offline PDF link annotation
    • http://riasztoszolnok.hu/admin/fck_upload/file/4776311826.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/panuzeme.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/totinelerezadu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q5l2eh6qeeb7tubm71cqabb0ij/xefuzi.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/70589326027.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/56363637120.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/bedogopaserepalu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/96330899462.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/nurugokuranumepu.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/fepilaxosezowidofaz.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/lelopegatopo.pdfIn PDF document text
    • http://letdentalab.com/img/files/zijaderiwutix.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/83391895272.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gasoxuxibudoz.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/waxugavi.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/judupotanusijav.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/54578020146.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/65699822016.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/gokumujinukid.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o2kcfm2c07v4ehmpq2nqo3ama1/53278764987.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/wodololokivuvironafoviza.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/30925920297.pdfIn PDF document text
    • http://peoplefoster.com/pliki/jujesoki.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/41710675053.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/muxizamuzo.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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 18568 bytes
SHA-256: 124a4393e869d5112b9ceea6e1bec5f8a5cfc9450ebe0d1631eb1252d0c60b71
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 10584 bytes
SHA-256: 0b49690af16177a1eb41abb9657baf3fe2dba957c62a1fb80ae3e08d68d3723c

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