Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af6e35979512268…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 06:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40e7e5f48168f409379cdb034631de63 SHA-1: 5595636cd9f57d226407b734943185b1b1b6ccca SHA-256: 9af6e35979512268d6b63beddc208871c740d413822824e0fdbc1e1cf736daa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting a phishing or spam campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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 https://www.oalysa.cz/ckfinder/userfiles/files/debitur.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/molaj.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/38374888170.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/78187543861.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/72325991917.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/55302790989.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/27242739219.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/gimorexejiboxat.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/32394480961.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/loxeferugu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/kimurozebivonawole.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/bagegegorajalarosijagevaw.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/jepobi.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109132211305607.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142225f18937---29403493089.pdfIn PDF document text
    • https://0900107678.com/upload/file/7749231762.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/23168783957.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/60776708297.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/35454002577.pdfIn PDF document text
    • http://ccsl.asia/files/19239585514.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pikopuwanulolefukasemow.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/vepuw.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/27964699494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=1000+in+1+apkPDF 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_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 9748 bytes
SHA-256: 78f1d02441e6b147009730e123c9377a4187bf8bbb796b0e967b81d823c12749
font_02_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 21164 bytes
SHA-256: 4c2bd04e2cc51e0194d841853f830229026c04822d79a4329d0fd1e103a8f870

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