Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc339ca0f0f2d595…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 14:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3deb885b58a9d118ea4c0a2f0bfa81f SHA-1: 1b74c1b2e7e768f0ec3d039371fb44f98a63d2af SHA-256: bc339ca0f0f2d595b9f037194c0ba82821f470d5ad7780e219d2d14abe41e207
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://doo-san.com/userfiles/file/20210907020038.pdf In PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tilitilebeladudan.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/70149309019.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/vegetalafukolitefiwivijaj.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54769843616.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/xudewikinix.pdfIn PDF document text
    • http://change4best.ru/upload/file/jogupaxufipuledomefopiz.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/75912258092.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/sefovilejo.pdfIn PDF document text
    • https://brakos.it/file/82501810974.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lukavadivetasomaz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154b5eb82b---tufiraxakomulavenipadimem.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/45578198367.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079b2aedbc---nemuxivabum.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/borumikizivemowafivov.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/96012124175.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/40786935590.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/40926512527.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/16739830268.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/93468511870.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jiwotakomuwemamusakunib.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/73967329068.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/22487940147.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/mejod.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/43486846863.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/58265577734.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/tivopuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=inshot+unlocked+apk+free+downloadPDF link annotation
    • 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_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 17340 bytes
SHA-256: 3e644873f3fc79fb9083599f5c0be3b4e5cde631ca62338e71f79ed6da0d4d2a
font_02_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 10852 bytes
SHA-256: 8bbd378dc7e57982e693ceeff58bcd4edc67d31189a621e20544bbdeed9b6188