Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7f0dcb91acc439…

MALICIOUS

PDF

104.5 KB Created: 2021-09-12 07:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9c8a2e612cabc375bc561790d6b480b SHA-1: 84652dcb41f81a27513180c8ca141429fe7ccc5a SHA-256: db7f0dcb91acc4392db74c823c258f5f75919c41773ef18b389bf999b50b043e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rw-hse-businessconsulting.de/userfiles/file/9858917374.pdf In PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rositeforamuvemumuje.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/90386401612.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/29649894603.pdfIn PDF document text
    • https://emprenderem.cl/files/togogijadeguwavetaj.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/30901193909.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/42285418656.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/17749062787.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/87523589078.pdfIn PDF document text
    • https://pmms-online.com/assets/file/86665492208.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/18548554083.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/9441696810.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/gimuni.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/wegex.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/85112703340.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/44597786546.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/tovuzavepuwuxaxo.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winujoj.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/juxifodomi.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/dudevi.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xofedufobeseribelixef.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/jeremawonimenegapakenes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bd58b5f2---popoviweloferus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=most+cheapest+phone+in+pakistanPDF 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_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B04 18556 bytes
SHA-256: a5ff2b89c927d555b8be172e7025509bcfefb11b4a3a56764618b2ff8c2ab4f2
font_02_sfnt_off00017b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3A 10412 bytes
SHA-256: 0eef2bcd5b93b8e22cf3ea0a64e312f0cf62d213748862b6ed54eb2402e07d43