Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dfe526a332f504…

MALICIOUS

PDF

77.5 KB Created: 2021-10-05 21:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5fcc492fcb15ecbc3244acd963b6ac80 SHA-1: 6ed23e650757b466197099d22ea20fea846249f7 SHA-256: e2dfe526a332f504764580b3068bb5ff9380181ed5bcd013763d3559a03103a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded links. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://purofirstli.com/userfiles/files/rodixefivokezegajopera.pdf In PDF document text
    • http://savitaco.com/uploads/images/files/borexotiwatalegajesuxova.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/widonu.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/71716769526.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/72290350456.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xexumofipomawu.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/16238627034.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rinipelumafamazotipebalol.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/falare.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/benitojufupifizokex.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210923123550.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/42053235936.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/rolevepekav.pdfIn PDF document text
    • https://bunianco.com/other_files/File/poterurijamabimefozux.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/22359434160.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/patemuxudonafuwosa.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/migalusu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138da27db81c---73104345398.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/goboleb.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/wusokusogunid.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/zadatabaputabotixuxupesa.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/pudujolorobelupubabezugo.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/jedodoxamiz.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/vopamepivuretel.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/zasuviromonasowavubire.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/36449959593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convert+cm3+to+mmPDF 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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 10192 bytes
SHA-256: 6e6555e7f69ebbb0d44610f4b1046e18c8a98893436c136d97d2172353b05467
font_01_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 19208 bytes
SHA-256: 3342f5cf34c1198079a30635866edd27301236e5d2b1ad57a3fa36870a32020d