Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f4df325530f96f…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 17:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de424e2959d5953ce816737924d28574 SHA-1: 661a931389b405af7d9e3a1c8dcaac4618ab9f63 SHA-256: 46f4df325530f96ffd95fae9fadf0fcf7bc851a3d4be8baa30c03195e0383b52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=arithmetic+series+formula+and+examples PDF link annotation
    • http://weighlessthisyear.com/ckfinder/userfiles/files/riroje.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/taxapamupupokex.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/59990387980.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135426bba827---19054152770.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/tiduduribodades.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tiwuneroputupujise.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/nototaj.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jatile.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/lopew.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/64969138516.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/ludafobakijagutarevud.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/48762142982.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/61401971139.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/pitazepabama.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/regipimodutopovetilan.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/45377176407.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/2273676045.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/timazuvirulikawudezat.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/bizoguka.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/80748235467.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/sekidujivik.pdfIn PDF document text
    • https://makenie.com/upload/files/45114976883.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/76272328484.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/jofulapilefapamorizod.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_off0000b050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB050 11068 bytes
SHA-256: e3b54bff9446a076183ab09b98edfee08abb31934fa7da46ef2e903c6202361c
font_01_sfnt_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 16940 bytes
SHA-256: f598af5ad74892c50128e41fba8c34c3e226ce66f0c29f233767380341c505c1
font_02_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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