Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbcc90af704132a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 15:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8727760268ae02fa24f4fa1f0159ff6c SHA-1: 0c1fce161e2ae6de9362a33bfe9eeea8918549e4 SHA-256: 0dbcc90af704132aa63e779439d3c61c4da141074cacf9f91d315ae070aade8e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, suggesting a phishing or scam campaign designed to redirect users through multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://malopolskiszlakwinny.pl/upload/File/gixazoxo.pdf In PDF document text
    • http://salman-is.com/userfiles/file/rafufugonakuwularidizipev.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/91704536289.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xesezexija.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pazulozoluv.pdfIn PDF document text
    • http://stl-hk.net/userfiles/jenudogusomama.pdfIn PDF document text
    • http://agavietnam.com/img/files/lodasofekejotiwakegev.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/79973774761.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/disukitupilisulo.pdfIn PDF document text
    • http://bluebossa.pl/files/file/tuzozigumokukekem.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/xepezikozogesas.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/67036485524.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4jegnjbkr5ghlis2unnqc7vf5g/sebigasitaramil.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/66033964945.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/87480259817.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/likezikix.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/zanafewozibatirejorobenez.pdfIn PDF document text
    • http://telektrans.hu/editor_up/32113331855.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/karivix.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2936575357.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/69292915741.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/joxebikiderobilisapexejud.pdfIn PDF document text
    • https://korankertas.com/contents/files/20822599289.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/13653629363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+change+instagram+notification+sound+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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 19408 bytes
SHA-256: 4090f85dedd5ee889f5e4abd59ab34e85bb5bb69b047fd9c328f1a4671a9cec1
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 11052 bytes
SHA-256: c8967aff7271a2ea7740692d0fa4db3946ce216f1e19f6c393d90b63b522aace