Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11ce25b81b14557…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 19:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c37940c31ad389f8a3536d7c1290a8d SHA-1: 053ad03d54e4ee925a20408d6974629b1e21cdcf SHA-256: e11ce25b81b14557dab8050bebb781732e326332cc7f4f570d762903bf5f7408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=movie+streaming+online+gratis PDF link annotation
    • https://vnjhanoi.com/upload/files/rebujamalaxupulelefebeb.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/14681319887.pdfIn PDF document text
    • http://upakuika.com/img/file/xakefoguwataduzuk.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/42480034636.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/70637222543.pdfIn PDF document text
    • https://togeltop.net/contents/files/sesefepofagup.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/muleponi.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/2991722649.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/pejoxizalesazaxufo.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/73452635896.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/65473716397.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d0d29ccb---witojerobuv.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/62703910242.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kajufudagulekonipoj.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/86091453951.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/97725613442.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/94681306055.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/421011123.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b5d6515---xenoruzobusukugajoso.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/17071819769.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/55347478565.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/lutezatawa.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/40655566950.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_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 17076 bytes
SHA-256: 0d97650973659c3ca68a1cc4282c40425ef355342f94180a2a28c9096a29b587
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 10508 bytes
SHA-256: 22e870779b8c3c32b9d47cdfeb6937e35926e0cf722fe59961152b2fd8002118

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