Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c573930cea43048…

MALICIOUS

PDF

90.8 KB Created: 2021-09-21 22:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5ec724d3bbdcef3a4a4d6ff26821353 SHA-1: 14e6b7e4377aadb938e4974622d0beeae46c3994 SHA-256: 8c573930cea43048e758decde4a2929e8cb7ad0866d0779e3792106e11380431
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=skam+france+season+1+episode+9+english+subtitles PDF link annotation
    • http://domgr11.ru/uploads/files/75441544249.pdfIn PDF document text
    • http://ping-property.com/user_img/files/xepupodulaki.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/revomogojuno.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/77392344238.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/91618490813.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/9382325231.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/losegenegewikiti.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/dixetixolamexal.pdfIn PDF document text
    • http://www.grifin.sk/files/xeziromovewowizive.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/getugetiguxut.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/jabidatoditedufugeke.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/tuzififetulufawujomokuta.pdfIn PDF document text
    • http://kalikraft.com/images/file/pixixafosonipo.pdfIn PDF document text
    • http://innotack.com/userfiles/file/letotuxebetoxupumoripakek.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/57755113406.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pawirabig.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e906daeb2---salilasumepixew.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/76426643315.pdfIn PDF document text
    • http://strandedtattoo.info/file/wogofifaz.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/pikilotalopugel.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/sewanakegoremovazasumiw.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161430d49e0426---nopagotelusirotegadeli.pdfIn PDF document text
    • https://endobible.com/userfiles/file/33562226770.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_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 11696 bytes
SHA-256: dc5b1d1ce528a8a4f11128f92d182ac3468680929171f79c2f3e3d72aaebf720
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 19156 bytes
SHA-256: 4bfe0949217805e6122bffe9dd84fd9ace44cc5ad00e07f6ed1e5ee6c0ca0792
font_02_sfnt_off0001459d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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