Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a03223530729c21…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e7ad9358dbe6877a0fe2b9aa6807cf8 SHA-1: 2b2271deec0e7bf6c9951f82cbd0bbe163400bd2 SHA-256: 4a03223530729c214fd2d6e533893c873cf0c1167e61bc2c5345c8a52c1c9f0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm on disposable hosting, reinforcing the phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=aditivos+para+concreto+sika+pdf PDF link annotation
    • https://propiedades.net/ckfinder/userfiles/files/pizesibebatu.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/dozezamixobafuwabexetigaf.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/24274778479.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210902022947_h3kdek.pdfIn PDF document text
    • http://change4best.ru/upload/file/83184960232.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/47386675442.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jitenabavafaraxorem.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/80489053398.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wapiwutesetibomanidamon.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/93675463252.pdfIn PDF document text
    • https://polaria.cz/images/file/92124707233.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///2583839722.pdfIn PDF document text
    • http://ty-int.com/files/files/wezenunofiwomijasisik.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef8476b2f---vizepopuvet.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/67145017624.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/vudazavazini.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/daridusizagitib.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/19515773715.pdfIn PDF document text
    • http://wjcopy.com/upload/files/25570038707.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/70860442809.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/14115587391.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/95513456197.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/19746473115.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b177b2f545009200442104ac3706c365/lamizegulonili.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/mafotegoluwurudap.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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 19928 bytes
SHA-256: 1cb637fd3a29bc46f840b079a6b61ca86847305d7b2ed08b21032791bbc901a7
font_01_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 10704 bytes
SHA-256: c1e6ddb8be94f4fee08305fe26e76c5c6a953e81568cd2ad6c10f67eb1ea3c54

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