Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf12472d06ff59e6…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 15:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a89662c7b5ac5e7721d2acd047fa5ab SHA-1: 630e18ee885c3f5067171c03f197f38baabf4c1b SHA-256: cf12472d06ff59e6528575da8c52aa981eaca7483671759b694ead2bc657dc02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://perfect-gallery.com/userfiles/file/70905007651.pdf
    • https://tipresentoio.it/images/file/xuwobowanivosemubara.pdf
    • https://truongthanhco.vn/webroot/img/files/fakafog.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/zizoxevobawefezibipuzem.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tajudi.pdf
    • https://soswzgierz.pl/web/uploads/files/47455091731.pdf
    • https://bestrecycledautoparts.net/images_i/file/vixujofugulawewusa.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/94048422376.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/57963827382.pdf
    • http://uk-finansist.ru/userfiles/file/tuwof.pdf
    • http://atthaya.com/file_media/file_image/file/23119318820.pdf
    • https://kop-trans.pl/uploads/userfiles/files/84932177008.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/38600500849.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/88127621472.pdf
    • http://elsekmont.eu/userfiles/file/kasalerojuwidufobutebiw.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e8bbe442---vofutizep.pdf
    • http://restaurant-lyons.fr/userfiles/file/xipenokupafepikom.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/pememogofoxi.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/25186866654.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/44578409681.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=single+white+female+full+movie+online+123
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e687.bin
9fd54d4773108c657ec73ba5a109afa51e7c1f1ca54ad92ac5a32ee955bd9633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 11064 bytes
font_01_sfnt_off0001004c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
font_02_sfnt_off0001185e.bin
1dfe18c03cb2be7e8642f670040c5cbb8c6975adda82db2980b8e64fc4fb7409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 19164 bytes

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