Malicious PDF — malware analysis report

Static analysis result for SHA-256 86361084c4cd4b6b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 19:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c14a237e62fca1f57924798b12980bd SHA-1: 5583ceac59ced2a28387d9c2120f1d10dd79fef2 SHA-256: 86361084c4cd4b6b03e22d404721a72cabbc548c4713167d53c3d820579f562d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the presence of embedded URIs and the ML classifier's high confidence score point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://crysiq.ru/uplcv?utm_term=autocad+plant+3d+2018+crack+serial+keygen PDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qcrdc7uvbnj1c1vpeue0l8c2rm/43767853769.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/4900904689.pdfIn PDF document text
    • http://cjatkinson.com/userimages/41016850255.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/xibasiweretotilisovizabag.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/xodupazi.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/131506_3582299907.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/mifima.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/jurilabubipopixuza.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/biribala.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/97799199351.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cc6873f39767040ec649c4afe6e50f58/61732099324.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/34105953473.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/mepelevi.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/jutedotezimadetuminomiv.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/66381883371.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109011131054919.pdfIn PDF document text
    • https://slotpt2.com/contents/files/52020502807.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/sizelogi.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/43915604932.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vodubopuludeso.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wozuleduwubarirarujog.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/16999056294.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090852657_1038316015.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/78011114133.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/13838107196.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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 18672 bytes
SHA-256: f5314c5cb1c3d2e6cafd0abb84966abcc433612d2ab5062d6a0e1f573d78729d
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 11652 bytes
SHA-256: e70003bdb962eb4283e3c60267d0a05487b3ab0727de55daf0526a40c4732b57
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1