Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1a5a855c0017c3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 08:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2eb50e908811382033ca06aef9aca831 SHA-1: 4bdbabee6add8177ea858fd67acdc5ffe5ead21b SHA-256: 3a1a5a855c0017c393fd47ed0f9d49b632934b01ccaa16f3e1a2e21e41798147
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://alfonsoguiggiarchitetto.it/userfiles/files/62602041498.pdf In PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/lonikevetubo.pdfIn PDF document text
    • http://julianina.de/upload/file/sorefuponikakamuxipugekis.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/xagifokonira.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/sokusudamedof.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/18030209396.pdfIn PDF document text
    • http://underbutter.cz/download/foto/41176893437.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/870898032.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/juwaxubokegiz.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/17866167878.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/nomafipejibo.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210901220810_oja75k.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed58b68e92---jurafejubidaw.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/24323499570.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/38875114609.pdfIn PDF document text
    • https://austarpharma.com/upload/files/momotibixofatono.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/tiladeke.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/tesuturapokipimaraloxaf.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/92906831190.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/kupasoxefugokuf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b81c3520---logagividexezavafabosoj.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/81563224061.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/76265460400.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/ripuzati.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/puvufedeliwe.pdfIn PDF document text
    • http://ternovykh.ru/content/file/99862183627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+demon+slayer+free+onlinePDF 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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 16492 bytes
SHA-256: 46dc4e96b0a924f37f21e59dd64ce50397535de38fb53775ca0c9e36f80a0a30
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10848 bytes
SHA-256: d0006c523a1720b4162358cf33cc000481415960b5384bc3ff823e0984e89c24