Malicious PDF — malware analysis report

Static analysis result for SHA-256 76878ec457453592…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 00:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1ceb95d3d271534c85f17185184242d SHA-1: 06faec52238191a8c3f835576e8e763e88430ac6 SHA-256: 76878ec457453592a3b468a4005b5d53b14953edca6b5effb98a1bfc7ddb3033
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=the+music+of+silence+full+movie PDF link annotation
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/45465978011.pdfIn PDF document text
    • http://carszana.com/image/upload/File/4757539291.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/kedokateromerixaji.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/44195764236.pdfIn PDF document text
    • https://network-italia.it/file/67829301940.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/roleladofukevuliga.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/59120846876.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618dde64aa---vuwobezapupakupobef.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/20995708014.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/69124195361.pdfIn PDF document text
    • http://clingac.es/d/files/gafofefutukupi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614250399adca---44969340921.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091409174861.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/52152424979.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/87669650436.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/waxixozusokevimiwu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dikizigusexudewet.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/56685650567.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/devuluzakokozakiwabor.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/vofagibobuzede.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/sokabozozijuburegikut.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/vutamutovulumujatem.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vovodanokene.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/39471347102.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/xafuxewanozipexiredekomab.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_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 10368 bytes
SHA-256: 248cf81446cd81c17146cdbd9f278e212d082b13a52043ee26c5db85fc1c08b0
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 17604 bytes
SHA-256: daaf5d898406ba588cd2874e0ee2cf28fe1f11408e8c06317aae49bac4ee38f3