Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70e3c905e3cde3f…

MALICIOUS

PDF

89.9 KB Created: 2021-09-25 07:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3eed5b3810551b84cb3e43503a5e61d SHA-1: 953516681439272e2f7aec0e7098bace89b037c0 SHA-256: c70e3c905e3cde3fb420e7da6915e28693dc0d134ac3c69b52f4faa1ff6f1f75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to unknown or suspicious domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.southdownscellars.co.uk/ckfinder/userfiles/files/32353839789.pdf In PDF document text
    • https://bloomlight.pl/_bloom/file/32504070281.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/xajivenurukinirumat.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zatizudegimigegemelose.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/fiwulirimiwik.pdfIn PDF document text
    • http://rem-proekt.com/f/file/xiselalixugito.pdfIn PDF document text
    • http://12shio5.com/contents/files/sipefabixobawo.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///bogusu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/52245055257.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/23569684518.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/perimo.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/8431969373.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/138536777.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/rajanogovetikax.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/81602889694.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95b63cb59---masutavasilaxapurokun.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gijatomamewip.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_2FC22F753A42D879.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/delovavofalapiza.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/82087801995.pdfIn PDF document text
    • http://blueyee.com/upload/file/201126063320.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a422ceb---88955042353.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/17537342787.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/gekosedasovajagija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=corpus+iuris+civilis+pdfPDF 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_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 18188 bytes
SHA-256: 44627a57c080883c879adabbcc0bf7c92059f7594f13916503bafed3e9a0f288
font_01_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 10316 bytes
SHA-256: 314f4cfb8fa4a00d4b87ff02e90c2475bfdc61297f872de36f6c7e41e45630f1
font_02_sfnt_off00014253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1