Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c46e80f1bb0a17…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 15:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d97127227c5ef0d47dcd51bc161faf16 SHA-1: a956cacc378bdba1bba2e1f11784175f60b621e3 SHA-256: b3c46e80f1bb0a1789e858e1d49b52e454abe793a532aa95a402abc5fd809e7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://krisoc.ru/uplcv?utm_term=france+ligue+1+fixtures PDF link annotation
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a6c0d6a---masagewivururatagi.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/vobilutetubi.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/jileze.pdfIn PDF document text
    • https://ntc-container.com/upload/files/10483586942.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/zijuxetupezawosizi.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/63721614247.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/lexilokugexasugilazof.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/38658274403.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/71273441276.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/19739511024.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/26598656521.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/95031865008.pdfIn PDF document text
    • http://skolky.info/foto/images/file/33428340020.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tetodefuwibavovamejujopaz.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kugitivep.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/zokizezimawuwalekovipe.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/somupaxuwu.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/lanomepidelonirijasepa.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613202cc811a3---69106899971.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/26362643350.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gokomiputumugamuxokenos.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/34821530101.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/dutolexaze.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/65256006092.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 17928 bytes
SHA-256: 3e78b97988ce4d14f369549b0833a35e9c20fcdb03ed567bbb79edb98c4d5fa9
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 10620 bytes
SHA-256: de796a03205de4fa0aa74cff8040dff606e0db2121b23a70cc43af3d0ff80913
font_03_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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