Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3fdc0793cae09f…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 21:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3524af33b5ff0e6914de99f906f1f180 SHA-1: 6370dc4f85c1884e0b97442bd2a8aa57e8757b0b SHA-256: 2d3fdc0793cae09f50de601fa10d8be718395589c252e552ab30295ac5955cc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=audio+format+not+supported+in+mx+player PDF link annotation
    • https://sunridgecorp.com/uploads/files/202109052250465122.pdfIn PDF document text
    • http://becucci.it/userfiles/files/94716480748.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98cd1ef2---somira.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/zimafezowojujazik.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/32931858560.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/fegisiwimera.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/wozolaz.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/68831028619.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/sapij.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/9692002823.pdfIn PDF document text
    • http://demkapi.com/resimler/files/xamekufezifowiwoxo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/baduwenuwem.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/tizamamewivowizu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/jufas.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/88764825433.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137678e59947---ralodupavuwesamat.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/38573381431.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/76152969989.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zasowewibevowires.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/budatavaligojimofuxazali.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/xujogemo.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/gepinedugumodew.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/14089370975.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/83912713966.pdfIn PDF document text
    • https://isleo.com/i_photos/file/geruvuzuretijo.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/vogopeboxiluwib.pdfIn PDF document text
    • http://apicn.net/upload/files/panewa.pdfIn PDF document text
    • 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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 19716 bytes
SHA-256: 16543c3f397639c71b4502fcef65fff6ff4f5430cd7f7eff4094cd2bd89d3b5a
font_01_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 10956 bytes
SHA-256: 9378dfa392f2593bc60b633ef7cf836a483771af5a5c6fe7671997a753c5673b
font_02_sfnt_off00013f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1