Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c178471b3fb7ae…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 03:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3210b71790c5c27ce7b5505eb6edc578 SHA-1: de112b66e9c038fb3f400461663229798068a7e1 SHA-256: 10c178471b3fb7ae9a0612dbe27d074978aa7a954091c7c56c3dc5ce859254ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern as a link farm on disposable hosting, likely for SEO manipulation or to serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pelejas.com/IMAGENS/CKFINDER/files/lorigibijebajinimared.pdf In PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/93008593515.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/jopewabebiribitimodu.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/lajijebenox.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/99337771065.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xedegiborixewizewesij.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/10083923181.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/kizixavenelemagepupor.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/mopalezupidutozikug.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/bexajivivo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a85291sk42hptqoe7fkqt56o35/6489977995.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/98981467324.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/koril.pdfIn PDF document text
    • http://373113.linker.tw/files/58808514093.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/xakizanarogomepabow.pdfIn PDF document text
    • http://szpk.hu/_user/file/didijuto.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/4105674978.pdfIn PDF document text
    • http://podushka.by/files/files/rejoxi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/46912304940.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/gogunafaluw.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/60956028605.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/rasilewevi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613066410d2ae---53965087410.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/57901116688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+recover+deleted+shortcuts+on+androidPDF 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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 10712 bytes
SHA-256: e222923afd0dfef22aa12cec3e216d679e489e2f470582cf97948db325d8985e
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 17680 bytes
SHA-256: b90f192bcd96aff3172baa180940d477b1e0f74d4362f177a2bcfa66dd4c1678
font_02_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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