Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6011b687e457cb3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 14:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa9bd07a02af442dbfdb98bcae77f37d SHA-1: 983662376027b5620320a910f9174b6a25ec649a SHA-256: c6011b687e457cb3d67bd5e6584548180a0d2d5f36e693a1959161b94e548ce8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to unknown or potentially suspicious domains, suggesting it functions as a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a large number of links on disposable hosting.

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 http://drkoopman.nl/cmsimages/file/nelepes.pdf In PDF document text
    • https://yifff.se/userfiles/file/karamapafarozakalun.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/42120731311.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/xetewokipetor.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210904_66D34024E33ED15D.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/bosubuvitutakosuzarudum.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/lipuxuvevidopototitasixas.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/virazeriral.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/buzukowonuxawalofunejaji.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/zusoxazuvofujug.pdfIn PDF document text
    • http://compsult.net/userfiles/file/memanupewomoxaxoxew.pdfIn PDF document text
    • http://packturf.fr/files/kipumikewitonabiwojilopis.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/45405156320.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/fodoriwufategatukobix.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/21700998894.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/63243168271.pdfIn PDF document text
    • http://htygroup.com/upload/files/maxowupuvaxewibigobogimex.pdfIn PDF document text
    • https://novsport.com/content/File/59041110136.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/3071908211.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/nudoris.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/29820447516.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/78056645418.pdfIn PDF document text
    • https://pindimana.in/uploads/file/61676397719.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/82396230371.pdfIn PDF document text
    • https://onlinendttraining.net/files/80566606215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=print+pdf+to+pdfPDF 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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 16880 bytes
SHA-256: 12ce2d1d3c7ac2fc9bccc01b00dace391830faff4d2be76ccafd6370cd57e6e4
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 9984 bytes
SHA-256: 8579c367fc63163cf722c04d13417ddc18e64d7774917d7d1c56d669f4b1919d

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