Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca4d5bc66ec637c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 07:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae23c18d98c32dba04e6e87fcb07417a SHA-1: 037654365f1e8df39cf0ae0b364c23821487d371 SHA-256: bca4d5bc66ec637cf7644b6507c00bd4de99baf6e3f75bb2e27d3f86525b3bf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://swiss-ex.com/images/blog/file/danagoviw.pdf In PDF document text
    • https://elnativocoffee.com/silver/upload/files/34185129647.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/nuxewedovozubizawowode.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613825c377882---70466795258.pdfIn PDF document text
    • http://julianina.dk/upload/file/matejisibe.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/88135672460.pdfIn PDF document text
    • https://dcimx.com/files/86544154698.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/regofisuvid.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/fepixowiwiwugigolanol.pdfIn PDF document text
    • http://sin-hua.org/userfiles/74466269766.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/vimenolaxizimasa.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/40933731388.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/pufujox.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/nuvikubulemoror.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gasowamonitimi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/50988014853.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/masebilo.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/110486712.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132151310b88---46998860766.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/pedalazovana.pdfIn PDF document text
    • http://eichler-kammerer.de/35581824770.pdfIn PDF document text
    • https://ever-progress.com/upload/files/56245761269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=solid+state+chemistry+book+pdf+free+downloadPDF 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_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 17372 bytes
SHA-256: e3aa21dca1eb89795397ec22d4370709a92bfe8c951074712e9c048ebdd2c78c
font_02_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 11392 bytes
SHA-256: ebc2cb0c49f0dc322a52898a59235d49362baa5cbb3d11c5dc3396108a28def3

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