Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce7d0aabc795df7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 10:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af7a279557df2711e665942f9d1905f3 SHA-1: 2e89de0db9933effd681e46f7ac85031ee550b77 SHA-256: 3ce7d0aabc795df722482cd81bb3037b5fbdcd3260d11e3a1d40d69ce1234e47
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, suggesting it functions as a link farm to distribute phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://synerhu.ru/uplcv?utm_term=almanac+of+business+and+industrial+financial+ratios+2019+pdf PDF link annotation
    • https://insp.biz/img/file/11980548408.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/daxas.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/69874334889.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tukigarizikexedado.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/38482287146.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/sawivodiridul.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/gakis.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/veranumuwopase.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/90683410093.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/witavafemelo.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/21974608761.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/vigopugowod.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/59585842653.pdfIn PDF document text
    • https://membermimpi.com/contents/files/sufavifinakinuki.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/69033689605.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/55257385350.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kutukewar.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf280786e---katiwizi.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/lofisedafusiwodofipe.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908081713776564.pdfIn PDF document text
    • https://termoformat.md/img/files/31442108297.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/62522483997.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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 11464 bytes
SHA-256: e441e37ef2e4da5d5a2962f03b811f4b68a8d936dadf871d29480fb960498889
font_01_sfnt_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 14812 bytes
SHA-256: 74e27f0315197152096159566b8ec0bce4e33c188db352ea8f8a5bfd78af892d
font_02_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1