Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae4e18d261a7c73…

MALICIOUS

PDF

91.7 KB Created: 2021-09-16 18:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 946bb0cb515f0239900116893986a392 SHA-1: 9e5abf9674626f1d58800e758caf340f54a97d38 SHA-256: 1ae4e18d261a7c7399484eb0fd0995a6d3fe1157747230c61bd55cd4a73c8b96
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 point to domains that host PDF files, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm and external URI firings points towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://absoluteanytime.com/media_file/files/files/regeweratiximarosupevige.pdf In PDF document text
    • https://maggievanostrand.com/uploads/media/file/lizofubadubigotebuxunekol.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/80852024898.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/59203877453.pdfIn PDF document text
    • http://altinay-law.com/images/file/busofuluje.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/14341993029.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/vemevafope.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/27001217013.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/63020247535.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/wobudutalosafomopefov.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/31035869678.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tulibufelavekuvu.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/56888354027.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nopotoxu.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/zokakitugowetuwajusoxofof.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/lisefit.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/948aad0605f29b9060f2fc0c48e33770/81828991143.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/31224249034.pdfIn PDF document text
    • http://biosite.ru/images/news/file/55586505011.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nuzonibopavupilaxabutifon.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/42155199563.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/xufedoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ever+after+movie+2019PDF 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_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10568 bytes
SHA-256: bde8a3020d61ce2e393103fb5ea58e515ff47be661d2db7e14e257b0e7c0ebf8
font_01_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 17376 bytes
SHA-256: 7c28abfe2b9820271409da1a62a2ea528f1628d56c845eea1ab408bf1fd581c8
font_02_sfnt_off00014929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1