Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2ca56a519a94c0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 03:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac9242d785440dd95a5c6eb992286d35 SHA-1: a8c00f5e3c5c6c8e9bd5ed1e6556af875f0ec8a3 SHA-256: ca2ca56a519a94c0a44e26ce947e8f0dbdeaf4103fff39db65aecaef2079f950
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a link farm with numerous distinct hosts and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://opuspointpartners.com/ckfinder/userfiles/files/xijoxirofarosowatuvizagi.pdf In PDF document text
    • http://123dvere.sk/files/file/muputufetipalikubaforu.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fodazedizusu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd3c98f21---96714768182.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/74648532237.pdfIn PDF document text
    • https://aayams.com/userfiles/file/kosenilo.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/49903781638.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/lulezolefegera.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/sovaviromaxemux.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/defevegef.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63970897623.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rafexisiz.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/48159713431.pdfIn PDF document text
    • https://angem.fr/userfiles/file/pakezovuxolevulusilituje.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/foxurulizof.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/21335610440.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/71043763008.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/56912335357.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/wuguxobev.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xaxodenad.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/63176178484.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/pimizeretifedaladigani.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/sirinawulewekebeziwule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=batman+game+apk+obbPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/83516250938.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_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 17768 bytes
SHA-256: cf203a903064fe96936617856750699652389f88f7d51c06809cd0066de93ba4
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10472 bytes
SHA-256: ebc3d9f39ccd62d4ff83d902ed0455cd3716afc1e7eb805eda779f819fc6e1da
font_02_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1