Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c85b1d823b7e9f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 13:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb96b036073e75742795d25e8eb60e72 SHA-1: 0f450ff653a326dfa663378f4f635161c5d31915 SHA-256: 68c85b1d823b7e9f35a8dc115f2a0d4cd4c1aab1dca2e6bf19293de24e757c0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cestovni-postylka.eu/userfiles/file/gudesapefudevapo.pdf In PDF document text
    • http://businessvaluationapp.com/fck_files/file/62697341104.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7d914add---mifawitudofawewukiwesis.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/fagebazebe.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/93245876480.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53021524982.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/loxovivudito.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tupupigibisaxamume.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/lumawudixaboxide.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/kusezanawewit.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/28930108611.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/laxanazet.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/suferosifipavitazugi.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vosaxikazosaxivage.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631304020.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909140546971686.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/vomaxi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/11768247927.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/tagedekofanex.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/42580525001.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lekofujumufani.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/sexalexebeg.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/wapogomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hungry+shark+coins+and+gemsPDF 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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 17736 bytes
SHA-256: 1c7372a2001b8f308882cca1f90cd79bde128f6f25fba1810a72ab04c4ddd39c
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10972 bytes
SHA-256: 6249d244e8c29cca15fbe9c1ff7eb1af31ae05d549e5ced8e98183d87c78f4b3

Open this report in the interactive analyzer, or submit your own file for analysis.