Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fbcd802426fff0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 10:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76e171b834638cbbc43fef661c184851 SHA-1: f27a37f698bb5836148a1bdc87823c8053b0f4ee SHA-256: c3fbcd802426fff0650bc85750b28ac2bb5e5643a83a05470f3d48c37ab9c1a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rinsacars.com/files/others/fesajefekuka.pdf In PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7088809296.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309077ed075---22219154840.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/noruzis.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/5494204768.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/60190387712.pdfIn PDF document text
    • http://mlead.net/images/e/file/kamokagurujo.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/vamelo.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/50841669992.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/semupexopibejogujeriluw.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/xarezivagazilulef.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/42069535675.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/67647036490.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/32047112824.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/tomedonikopusudobupakali.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109091107042233.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/56475600536.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ladofud.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/zibigeziju.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/64157887604.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/41453697680.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/rogumid.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/zobuxivapativoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heroes+arena+hack+apkPDF 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_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 14728 bytes
SHA-256: 0eeb076b9413294b6d140cba335bb20b78e1dca681387f3e09e6e411c58940d4
font_01_sfnt_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10316 bytes
SHA-256: c14e94d485e69efb56737f0cd7096dfc6014fdd6d267c7ba113564882710d091

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