Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8c5c0f66571cb9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 23:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6439e137e904b0820eb8f0753baa624 SHA-1: 447d7425dfded1efd923ed3e2d0c8348a1475935 SHA-256: dd8c5c0f66571cb929005819ead68e70bf4ed2d949c91758f8a9a76f2796719b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a redirection mechanism to malicious sites. The PDF structure and embedded content are consistent with attempts to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=best+camera+app+to+download PDF link annotation
    • http://kaiyudachem.com/filespath/files/20210911122450.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/kotobegugiluxufizokamaxe.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/lezaliraxixaxekavijat.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/nafikomubupawijolewusal.pdfIn PDF document text
    • https://mmtours.si/uploads/81648133211.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/vuxuzatedelo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906153754169320624.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/92983987988.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/patizuzidoxofanowet.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/82713117536.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/vegetalafukolitefiwivijaj.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/posajapuzi.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/20040840444.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70e65ee24b4fbcfe23bde7485acc2492/togetoletil.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/55978597458.pdfIn PDF document text
    • http://asqcert.net/files/files/fofomabaluwamabeleseb.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/filiviluwapuwopij.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/93932958489.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/83158891560.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021985223569.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/95925267820.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f91f95774b---87666197172.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161380188243eb---97111718504.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/10634138519.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 10724 bytes
SHA-256: 9effb99929c8defc472787dfd1367012fdda7078b5ce01616803ea3271126af0
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 17008 bytes
SHA-256: 4e3ad27d445cd577e924f6dacadf3a5ea3fa6f6acf1b1612e1ae8cb40fbcd682
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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