Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d2e467613a1b27…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 13:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2881e7bddeb02a34e77a88d3f6b8de22 SHA-1: e2a458a2255883f0fcf3b04d0dbf77324e54a36e SHA-256: 29d2e467613a1b271302a6569da3fb943e1d3d962c2f4b40ebe23779d2610f54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the PDF as a link farm on disposable hosting, reinforcing the phishing or malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=tanix+tx6+bluetooth+settings PDF link annotation
    • http://suachuamaydemtien.biz/userfiles/file/nanezixagusubemolimeluno.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/19734590212.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/23/file/fepozakosilamabuwugodi.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/37128743864.pdfIn PDF document text
    • https://icbacademy.com/upload/files/rarumuwaf.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c54918379f---wutedoxogiwesarakuwepakak.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912000103.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/88923939242.pdfIn PDF document text
    • http://hadt.vn/upload/files/77074164569.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/7261611304.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/97667224556.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/18448279958.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/balezegigex.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/dexewevirefeg.pdfIn PDF document text
    • http://ropesadventure.com/d/files/55004789965.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/51238480345.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/zirevadobarudabosozerit.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/93459329659.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kowimowegokeve.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16145b9298d091---bexisunemevuvejavabu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/rawaguz.pdfIn PDF document text
    • http://enricobarraco.com/files/38721363960.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/82815846312.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/16199558030.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 10760 bytes
SHA-256: 8f2366c22498aec3270df2459572406f3f17276641b1778caaca1520421e2c05
font_01_sfnt_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 17104 bytes
SHA-256: 9fdec2e1bd6c0fe5481d898cba3798fe5ea1852ca73e9a5ead139ef10abb5a16
font_02_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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