Malicious PDF — malware analysis report

Static analysis result for SHA-256 59219b97b4b2cdb3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 16:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08d3f8b6780e5a067b1bb4880cf7511d SHA-1: fc231a84d7640848ec4e5e9e1fcf68af97fbc101 SHA-256: 59219b97b4b2cdb37a8faf769ef645795917202823de54d6a2552b3a302a4452
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The document contains a link farm with numerous distinct hosts, suggesting an attempt to obscure the true destination or distribute malicious content across multiple sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a potential download or redirection to a malicious payload, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://joyear.com/ckfinder/userfiles/files/zexawaxanatujopusesunesu.pdf In PDF document text
    • http://levant-tekstil.com/other_files/File/sowevuwaranavamezizumu.pdfIn PDF document text
    • https://alohasafaris.com/files/rafusigesezuwa.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/86831390598.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/10603429450.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/92707149757.pdfIn PDF document text
    • https://netlandschool.cl/files/talukezerapimunowu.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/47064376387.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161432c645a00d---69134036638.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noropa.pdfIn PDF document text
    • http://portableandcool.com/files/files/fazubuxixizamegita.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/50216492295.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/guxuwizepetezibevu.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/risedudafazobosebatiw.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/32598319840.pdfIn PDF document text
    • http://opsir.eu/files/file/ridatotiwaguj.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210909/210909061723034227a6w7bc7sykdb.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/612956129613a6cbb01682.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fowuminumiwosokagiz.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210911105022.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/27961736279.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/vupejagafug.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/42822758785.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/fewatamatovamuzobemi.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/6152980488.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/vujorazunudedatoviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=poco+m3+android+11+updatePDF 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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 17232 bytes
SHA-256: c8b9e87321cfee80df73697a3004fb2445213628392725b0715dbc2388426521
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10784 bytes
SHA-256: bbcbeda7b32476d053f05ce96fe7ee8a5bb952cd7ba6058b79e574000de63368
font_02_sfnt_off0001319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1