Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb523accbe773b1b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 04:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75bd31a683eda4229a782abbf6d53a1d SHA-1: 907ec24b7386e0a8f5338a101aaef3dcbd547447 SHA-256: fb523accbe773b1b817f556c92eb26c160947ba190d24c29d48442555efd598d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains used for hosting files, and is flagged as a link farm on disposable hosting. ClamAV and ML classifiers identify it as malicious, likely a phishing or malware distribution lure. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://sovaimm.it/userfiles/files/87737330976.pdf In PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/sexidusalogag.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/78986483769.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/9882034549.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/10523936948.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/voxasi.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobawodatuko.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/zudidubejajimif.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/79901844992.pdfIn PDF document text
    • http://strap.sk/uploads/files/jukudad.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/raxokijavixusu.pdfIn PDF document text
    • http://inphilong.com/upload/files/56273685528.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/63267136789.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kuzukem.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/30575284195.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/zubado.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/gizarugax.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/filana.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/bawikemanunefuriwitig.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/14474809932.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/nuzojebozuveged.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161375c2385d31---wupixolujoxeju.pdfIn PDF document text
    • http://ailizia.com/userfiles/76650074979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=reading+mobi+books+on+androidPDF 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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 10724 bytes
SHA-256: 1544dca8c7a05073bb8e47e220472df851100b6d1f1411226d6b6a301085586d
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 17672 bytes
SHA-256: d69d023745433f5e374b8f1955b3bd829a31a3c995f3da410074182de27b664f

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