Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60a81b2b0381a79…

MALICIOUS

PDF

87.7 KB Created: 2021-10-06 15:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2650ca462a89a5e6a8e01a4ab21bf9a2 SHA-1: 7a4de31e6781a459a6cb52299bb30dd2e913a4ba SHA-256: e60a81b2b0381a79ab3cbec74917d71cec7543f8506b280e9b1ab616fa3ab244
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://duepassidalcentro.it/userfiles/files/wudisutoxanifuw.pdf In PDF document text
    • https://vmwarts.com/ecovic/file/44635547871.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/dowaz.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wububosorekibin.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/77052364086.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/pabuta.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/tarinefu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/somusalowifatarobulow.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/jovelowigasifemo.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/64704562379.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/41dc608dff74126397fca785980239c0/48017923601.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/25981088324.pdfIn PDF document text
    • https://mentormedya.com/files/monolaxuxoweraza.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/58116396065.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/fafikemug.pdfIn PDF document text
    • http://epplast.com/files/file/26961293972.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/murilaratipodapuzetogapos.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/japeguvedoduta.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/6592736750.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/10415120063.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/53329908290.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/guzawepapobixaj.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/34160367344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=solving+quadratics+by+completing+the+squarePDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 11600 bytes
SHA-256: 1da6c9b1e89679e95cf45805b3959e0a9e0184561b65fa62c846e519a8d11d83
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 19880 bytes
SHA-256: 0d9e2c55b313138a62c402954931e0f05c134ae6c9d99b24f9a22993b85cf5f3
font_02_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1