Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66f220a44cc014d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 06:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60293909b115b5ab2474b59bc4c381d1 SHA-1: a394aff5fd59b14cbb68877ed250f742dfa22118 SHA-256: c66f220a44cc014d8a35bf3cc53f04cd36130ab54e3b17e6d48c7c482376b530
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing operation. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/87729340159.pdf In PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/93874092033.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/76667784468.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/webalalotozadalomob.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/71238462188.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/39976828020.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/mosuzemutovupiwegafikuzog.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/99622145636.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/45620303226.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/zekisovikiminimenon.pdfIn PDF document text
    • http://retailcop.ca/files/13235003293.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/jedufewovatowitel.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/ruxawejisotamavodabugi.pdfIn PDF document text
    • http://namngonviet.com/user-/files/difuwazeb.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144079f7d49c---11276809421.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/63630505914.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/fuziniwoxolibi.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sapaxamor.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161405b49e598d---tezunosuxagowefifajepe.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/novezilajuvu.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/55640415257.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/95495716496.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xosonojuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tutu+helper+apk+downloadPDF 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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 10472 bytes
SHA-256: 44d59f99a1e34868b47f52e69f75a19e8783e463bbed6ac020d85aa5e04bed0e
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 19036 bytes
SHA-256: ccffd7f844f04cc7f016734212b5775087e94e2078cc8e50258d2da56505fc36