Malicious PDF — malware analysis report

Static analysis result for SHA-256 e137de7a1d4149df…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 00:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9cd015d2a9674561809a6e4dd2f0217 SHA-1: 906403238e0a1be8bc39f32708446fd4cfc17bda SHA-256: e137de7a1d4149dfcf6f57152351425393ee432b0261b19709700c375e4c1a89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent related to SEO manipulation or distributing further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://studybrilliant.online/app/webroot/img/userfiles/file/wubaxo.pdf In PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/dujus.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/tefirarasaworelixef.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/woguredizavalanilemikejif.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zitibitivugurijilofuw.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/satolepewudesavazesipopez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce7821a81---53990308322.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/46542622520.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/kowozojiv.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/66698169458.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/86071397068.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/39487667141.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/43241159809.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/94257029548.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/44360180885.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xesumasudewibe.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/newasamozosunorawex.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c77c111---powalevezifamivawasonog.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/xebezunawadexemejelozunix.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/rabiwi.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/remesasapumufuwivejuro.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/jetujapuxegemixanunepuv.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/49233449111.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/podedumatar.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/8655492424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=broken+embraces+full+movie+freePDF 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_off0000b7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 10852 bytes
SHA-256: cbb9e0e8dc5905d3fbc189b88802bfc83c51f311d52d9d496c364fd120056729
font_02_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17744 bytes
SHA-256: 73a9327ac9272b3f0956677385b76c429c1d1fff4e8e45dc114bf88abc22b16d