Malicious PDF — malware analysis report

Static analysis result for SHA-256 be53527a844f519c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 13:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2482b74aca4e8c3b7faf4244c80a569c SHA-1: 089017f8110709b1b6bb0b852fba8de2a021cb19 SHA-256: be53527a844f519c2c54d9650e1d34fad1e83c416dedacbf68f0cf5736afd9b0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and heuristics point towards exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://acrclubinversores.com/files/galeria/files/1965407213.pdf In PDF document text
    • http://eptesteplelek.com/uploads/file/kulanimotewipuvoziwi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/5541955589.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/19842768684.pdfIn PDF document text
    • http://ewtch.com/upload/files/64055311115.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/35563324784.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614114181576e---27556888972.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/kubilusovusesepes.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/buleguzajob.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210904_A446261D762E8737.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/nifiwemobule.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/92636822334.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dibuwibidoka.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/78762261820.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/jezakowovilenidodijenimel.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/49643968128.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/10769094496.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145800115824---bidusosi.pdfIn PDF document text
    • http://wajl.net/img/file/20219343025.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/todojodejalusikodo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/xegewo.pdfIn PDF document text
    • http://vning.net/filespath/files/20210920101655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+1+talking+angela+2PDF 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_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 17588 bytes
SHA-256: d0e4e0f9a724eba8a1c154232bafab8909c60d84d2c29842bc480a0addcbf752
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 10500 bytes
SHA-256: 388e682d586a92df709c3e0dd6836ab3e81d8a7f13342d79e108a3b289b1382a
font_02_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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