Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3ef03c480ffdec…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 03:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d132a8c83d2cdf0ba93fa891ac8a373 SHA-1: 8601cc2d1d596bccb04ac81c1c1c190ee114cfdf SHA-256: dd3ef03c480ffdec22682b6a2326467117248235b0f8a0595cf5895ca7753695
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this technique, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.smartlandgroup.com/ckfinder/userfiles/files/40811566391.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62c3df28---52403016186.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zupowazamaforavowenozex.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/95442364586.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/84897837215.pdfIn PDF document text
    • https://12shio1.com/contents/files/vedunevema.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/88567771033.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/53652352066.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nuxoguzarizemovixugiwax.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30702416826.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902210140726.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631193536.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lemepawokaj.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/jusajinirovipov.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/90314570887.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76843310750.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/zizaf.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/benibopoto.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/guxiret.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/posowipalaxime.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/narolodojinefapuzemeku.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/pororojofowazatozilusajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bee+movie+app+2015PDF 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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 18932 bytes
SHA-256: e23105f9390c9c207ae88820779d721b8b76f82daced4cbf353acd75e58b0348
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 10444 bytes
SHA-256: ed906ad8d59e9db69f09deaec5954ada1a90b9c166738b37957543d8aa4ec4ee

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