Malicious PDF — malware analysis report

Static analysis result for SHA-256 f721b45e4ba18eba…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 18:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb55b02a4e6b318308cf6535c2284d37 SHA-1: 74de0b17cf0391728e2d439af564f638f760df75 SHA-256: f721b45e4ba18ebaa9f44abeb17820ae0da24a1fe7d686c65eb70dd19838bed2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ecolservizinettuno.com/userfiles/files/11704559247.pdf In PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gosogoba.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vuwapexuniv.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/2461308221.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/pavafipadelugitabituv.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xujare.pdfIn PDF document text
    • https://superchills.com/userfiles/file/lidokejaguwimubinev.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc1c5f810---99812243009.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/zamuletewimimu.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/99662702617.pdfIn PDF document text
    • https://people11people.com/uploads/File/godaturemamixubivevi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fb513b79ea37585001e755843ebf0386/letowojikexogakit.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/9210468930.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/47874696923.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/tezuwawapibenaxumet.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/28582973768.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/wenitoleve.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/999015674.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/72843210604.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/25367095890.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/64435763212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=top+countries+by+gdp+2020PDF 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_off0000c136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 17436 bytes
SHA-256: 625074bace28f9aa70a6adbad52a8ca94dca8c31a5dce80ac69b449266040deb
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 11040 bytes
SHA-256: 24d3ad6ee9ed50604d9c29a2ee1afaeaaf732bbedcbddd7fd4cddfcc6a963659

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