Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc023538f525054…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 10:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46f61b7a2813521a39ae8194c3222eab SHA-1: 97c9df3e8b6831e811f2edd8b62155ed20a2f6ec SHA-256: fbc023538f5250543b48318ee8a5546a28fa4d9b6325399dddd57cfd8720700e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier also flagged it with high confidence. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://pixomot.ru/uplcv?utm_term=real+cricket+go+new+update PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///lugajuwog.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/17008390399.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/xadopa.pdfIn PDF document text
    • http://irinabailey.com/upload/files/nufilabiduji.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/vifigure.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/fazeguluvuvatemesamajona.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/biziwijakod.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/rezarasoturujabomadokuxo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/57937834242.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/5672395964.pdfIn PDF document text
    • http://effekt-film.de/files/file/zowuwurebotir.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/lipidujilijek.pdfIn PDF document text
    • https://andana.us/files/files/donolomulofogu.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/jokowoxigi.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/wipomelon.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/66348430921.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/20251490171.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///52649584171.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/gegilatotivuv.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/rozakopemujifagefipi.pdfIn PDF document text
    • http://irinabailey.com/upload/files/7258600926.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328234c6593---1166660485.pdfIn PDF document text
    • https://path.mn/userfiles/files/29748222643.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5e796050991a60efb443f01cfcfd1bd7/97638362534.pdfIn PDF document text
    • http://www.pvvc.cz/files/fazijapokijutor.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/tutadokabukibepomusoxuj.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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 10844 bytes
SHA-256: 9a604a2a5ef84c699a3910bba75b5e427ded61f89a907641c69f295346a2a990
font_02_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 14668 bytes
SHA-256: 8cdb0af31d1218f3af792e100590e487844e636a64968c789178ee2282d40a4b