Malicious PDF — malware analysis report

Static analysis result for SHA-256 41854eb9363962e1…

MALICIOUS

PDF

67.4 KB Created: 2021-09-18 02:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2655d6cc34ab86a2b0e290c98e67e0ad SHA-1: 27513df5bdc944b413a666a7da8661ff8cd36896 SHA-256: 41854eb9363962e1271cab9cf0e25efa153f6c370fb2d74601bd28d50fd5c84a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by heuristics, indicating it's designed to trick users. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://geerhannutpourreussir.be/docs/upload/files/wasixenus.pdf In PDF document text
    • https://dampinggame.com/calisma2/files/uploads/bekepurepabinorigukomiriz.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/70327300131.pdfIn PDF document text
    • http://e-sheremet.com/img/mugexomumidavobomuradij.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/tetekunotizefewepuboder.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210902063420453.pdfIn PDF document text
    • http://edallyshop.com/upload/files/xobategumikujizuned.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/40853446115.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab93d56bd---82729087288.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/37809704567.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/62366356643.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vakutukizajilorovavu.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/53766089365.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lulumazaxilazarixabug.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/waxaxabamanibufogiropo.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/87615042739.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/82272247113.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/pejuzekerixoxipimanefusit.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/92524516691.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/regawalivodovizofur.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/wemopumajesopisazisufas.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/zajibejusaka.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/73528587071.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210908021610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mario+kart+wii+rom+for+dolphinPDF 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_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 10632 bytes
SHA-256: 8710f0d96bea58d0816832c64fbba25af9113b41949389db7953e1212a5dd4f4
font_02_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 13732 bytes
SHA-256: 033e96ae21697ec3607cd8d3c06e9ec5bf6fb8507ca8d47ae1cbdc0160b1ba62