Malicious PDF — malware analysis report

Static analysis result for SHA-256 90efeef3edda093f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 17:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f8fddc89c7b6cb37d633bb9881b79185 SHA-1: fc7c688264dbced3e4745a8e0638cf1165ac8ce1 SHA-256: 90efeef3edda093fdb5db510329d337b32aff41766c8ce5e9aacb74fcd2b59b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and the classification as a link farm strongly suggest a malicious purpose, potentially related to distributing malicious content or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=infinity+blade+3+mod+apk PDF link annotation
    • http://pro-group.ru/userfiles/files/81720934380.pdfIn PDF document text
    • https://olterus.net/contents/files/befipazub.pdfIn PDF document text
    • https://sergiomauri.com/images/file/norexeridu.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905084405.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/41246900888.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b1857c99a7c99458c2fbc85b994ceff0/92851716176.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/230102156231.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/46324832174.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/70080795880.pdfIn PDF document text
    • http://abc-tel.ru/data/File/94082488320.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64790333267.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/bixedat.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xovasadumazodutub.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/tijilizobezelaxov.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425eac0d8ec---megazifaganixeziv.pdfIn PDF document text
    • http://i-physiology.ru/upload/razofamel.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/78465491078.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/lobovinifowewezevo.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/75312734752.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/89348721358.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/23221672332.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-22/20210922163056357429.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/62321392298.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/42580027375.pdfIn PDF document text
    • https://laser123.com/geektic/files/67357720008.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_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 10860 bytes
SHA-256: 8b08984abc4a38048066d60b145e10e0fdd832982ca082e084d7150b5331715a
font_01_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 14596 bytes
SHA-256: d13d79b5a47902a3568ad125f9d4cf4bf793952f4101a276bc0dca4311198034