Malicious PDF — malware analysis report

Static analysis result for SHA-256 964f11f9800b43ee…

MALICIOUS

PDF

87.4 KB Created: 2021-10-04 18:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c86c51dadd91dc5c926ca053ade21328 SHA-1: a32b852ead389dd40d02cb37f229d4db542cc0c6 SHA-256: 964f11f9800b43ee4662f13b2b2a25237eaeff6c5fa30c40fc8b2d917515a606
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to distribute further malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates the document's structure is designed to host many links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=the+ernst+%26+young+business+plan+guide+pdf+download PDF link annotation
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/keterikadidutawexomiluv.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xesotuzusokuf.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/4296549875.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210925_8625C539A13B2A52.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/45377810556.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/fijekoxobitabuxefadalexu.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/83024875236.pdfIn PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/fufalelefa.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/lopivefa.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/74460137874.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56212891428.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/84e4bb7c3fdff42efea798a18392ce7a/luduxefesamukab.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/wexilinuli.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210922212351.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/lafumezedaze.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/sugapikativawomavimemixa.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66554209491.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494747396d9---nuvefarof.pdfIn PDF document text
    • http://elsped.hu/files/file/goganurewo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090323241273499.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/91187315457.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/75379607843.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/35535015895.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/dukubaketixipete.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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 20760 bytes
SHA-256: 935a2da84cdcbcbd6757b0c6b57e257b119ad20fdb5d471013471ffb77fdb416
font_02_sfnt_off00013b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B65 9748 bytes
SHA-256: 67857743d12b6215e52f61e8ae50169f0a3a967400c6ed2d62182fdd8f2ae738