Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac09956ade2c0187…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 02:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e644055295dab743bb5eed629ce93af SHA-1: 553d274b05bc0fde67377cb03014436e452f5935 SHA-256: ac09956ade2c01872372bc8ed677a822b3b55842c444d02ffc06b5d47c6cdfe5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and heuristic firings strongly indicate it is designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=pokie+spins+83 PDF link annotation
    • https://cevhertemizlik.com/userfiles/files/3874593611.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/39203426402.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vekapividefunepax.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nofoxomukakeguput.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/95995330189.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/wejovus.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/tegetu.pdfIn PDF document text
    • https://senfina.top/uploads/files/85445488803.pdfIn PDF document text
    • https://anaksemut.com/contents/files/gavanog.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zorazifud.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/181201554361300754dbee4.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/66191837944.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206e09e896---lepimujefabi.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gabunarazamix.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/bonumonen.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/82590565877.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nexiduruzuvos.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lozudodalesozemaze.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/15829235685.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/fafekowezuzuxevaj.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/03aec55d88d77db18c18651dadda2e01/70942081570.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/senajixesalotuwamel.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/78551799160.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/wividexusajo.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10312 bytes
SHA-256: ec55a63927d1b4d2f5a99214bdda04ea790f32a536a594a100f78daabd17468a
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 18520 bytes
SHA-256: 9f637b220bc5a7af46a297f030ff2fcfebf62d745bdecaf52cfb16125474585b

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