Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7cc66395e692f5…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 04:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03c686a6b7f17a14d4362f51c1ad8930 SHA-1: 3a56365bb9c3de06a7bc623fb4aa5c9b5ff28f4c SHA-256: 2b7cc66395e692f59fd1f370b12c3edd8cf37a09150fc89376d57cf139b6df4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link-farming operation, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=how+to+clean+junk+files+in+android PDF link annotation
    • http://guojingmall.com/userfiles/file///11983957102.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/nidatupuj.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/4288887082.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/vinilunobe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pagaderoso.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/30625224518.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/gopegepudedivonozepi.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/pojalusege.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/18621176362.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/toxesigumojur.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/32727285411.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/56223694609.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/81060361066.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/tumirilenepevubam.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/43454259766.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/suwisavirinirunelomexal.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/5712992794.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/76328677035.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/95639650653.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/29909467413.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06678c188---gipalogofexuwifoxamup.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d626da5f13---punuwujeb.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/simufurasowoxowatet.pdfIn PDF document text
    • 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_off0000c474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC474 10868 bytes
SHA-256: 6a1761e8c85ef1671647a9debeb4d26a95030dad0ad3642baec97a4e57c1de7c
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 17872 bytes
SHA-256: bc3893af32bb821c721547a35c380ae470e78d433367e8863936585c8e50b653

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