Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eb79e5309fd91c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 22:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7037846ea9abdb9ea92ee32a17045fa8 SHA-1: eb887259c858eb2529202dae6f7f53a29851f16d SHA-256: f1eb79e5309fd91c03db560796d08128b27396ccaa02523e72b2e6d97bf04f15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the file is designed to redirect users to multiple external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://raegcafe.com/uploads/files/tesigefafigubasevoropavof.pdf In PDF document text
    • http://vkts.se/userfiles/file/67035475439.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/50666298718.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jajipugamizalaja.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/94943051159.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/72020687752.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/4598801494.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/fovokafemisuteduve.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/52125719402.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/toxebametuxejire.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/zirebagof.pdfIn PDF document text
    • https://vleek.com/uploads/files/1939002607.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/gikulajatojelogovulixuve.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/63291658484.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133916c26996---kojodonovativiganevem.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/41073101358.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gapizefizagegelom.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/72777608168.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/rirafuwewejusiveto.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050529412155.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/rumodenetirogojajusuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=iphone+12+pro+vs+samsung+galaxy+note+20+ultraPDF 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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 11236 bytes
SHA-256: 14d150a38a60890db35881f6807d07f5ad08f29ca4bacf286bb79c3137aa6802
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 17280 bytes
SHA-256: 302df215294eab9a462d5983cfd50a2f1e79d173c212dd162f145ee80aadad1a