Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1247525ee2e4ac…

MALICIOUS

PDF

81.3 KB Created: 2021-10-23 09:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 970a2c7d0e5d9a73961e4ace563b1a50 SHA-1: 113709ad77eb42c0ccdfbfe6c1519dcbc553407e SHA-256: 6d1247525ee2e4ace5ccd60553fa3e160491f2b048f84c3844b9d63c4daf9d76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, with many embedded URLs pointing to PDF files, likely serving as a lure for phishing or malware distribution. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lunaleo.pl/userfiles/file/20470627552.pdf In PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sosobe.pdfIn PDF document text
    • https://mkontakt.com/dat/file/57004999796.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/91141813829.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/rasilosalonufuvosowolew.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nijurerozirexe.pdfIn PDF document text
    • http://findacommodity.com/upload/file/9280501019.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/moravutegiwa.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/mulupedixalajakazomarolol.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/53607212114.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/datofiz.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/solikezafo.pdfIn PDF document text
    • https://ka-base.no/images_students/files/67563022474.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/14057828975.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210927_C861C784DADD7894.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/12849630375.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/nafutatiwazulojugofapaje.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/58553581998.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/89404095321.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nubebobidudobegod.pdfIn PDF document text
    • https://majubesar.com/contents/files/9426667078.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/fadikoj.pdfIn PDF document text
    • http://puisan.ru/uploads/file/29831178413.pdfIn PDF document text
    • http://cpviettin.com/upload/files/pogefivosategik.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=cash+drop+meaningPDF 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_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 10724 bytes
SHA-256: f40d902d67a8dea6cfe6c82cf44b5a306a3afb6457667262735ea5e8dcce3284
font_02_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 19140 bytes
SHA-256: 016086697bb3274ec7f6cc1fa2339183379d88152abdffe864c7632c8a2a2993

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