Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf6aa6d43d1f331…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 603e500c6cd8d42a708ef5610ee5ce7f SHA-1: 178df25ae8a733a354dc06df1ef21a2b3c08bafa SHA-256: ecf6aa6d43d1f331a306d05fa6005e8894324be952786b909684a9ee13753bc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=watch+high+fidelity+online+free PDF link annotation
    • https://wita.lt/images/files/letopawamerubinimeza.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140905a6e37b---zewinopefi.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/ligul.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/1861823699.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28016770022.pdfIn PDF document text
    • http://airfa.it/userfiles/file/79191845004.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/70629423587.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/kodal.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/xesavadukalosemasugel.pdfIn PDF document text
    • http://sun-tes.ru/files/file/begixud.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/29714580578.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909040235746764.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/75475120271.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/selamojozugapezune.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/12692430951.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/lamopadotipodululinexara.pdfIn PDF document text
    • https://revive.fashion/upload/files/vadulaxamemeruzonunupajit.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/15155084966.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/37890264135.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/xufafoduvasuzufuwikelipok.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/1173933433.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/78547869717.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/sisotomosuputejazenivemor.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/titima.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/27658648163.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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 18556 bytes
SHA-256: 386d02bf01f8d16699b31dababa0b8299356c125b5f0e68b23bb53f293ec0866
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 10692 bytes
SHA-256: 5655f3d81494f16e7e93e96186349a00258097ba4088fe4225f7081727e200d7

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