Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea6a5b67c2645e7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 16:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27d825132afe7f4f26f0e8fdea2e6736 SHA-1: 551c2468c8301d94ccee3a6add987ef811fe2f42 SHA-256: fea6a5b67c2645e762bd51899735dfb63c8be3870b6a70e160af1e0b0a2163d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://4x4autok.hu/userfiles/files/vofotaxiki.pdf In PDF document text
    • http://paulabenveniste.com/UserFiles/file/69584079240.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/gilozijudon.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/11801343176.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/jexifivuzoriwedepa.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/1743693847.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wuzobibiki.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/texupurifitetepaludafa.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/logimorutij.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109101353278088.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6cd255e5f---pedumolutusubeturodif.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/46748220147.pdfIn PDF document text
    • http://aven.su/userfiles/file/25764658297.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/67466989863.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/genojudazevo.pdfIn PDF document text
    • https://unaizahic.com/Files/files/likunodedadamajavelelol.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/83306471266.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/11927651780.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lepizidur.pdfIn PDF document text
    • http://enricobarraco.com/files/zowapajaranidovil.pdfIn PDF document text
    • http://underbutter.cz/download/foto/52021533920.pdfIn PDF document text
    • http://boardmark.com/files/file/71895282721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+close+all+apps+on+android+phonePDF 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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 15896 bytes
SHA-256: 8c314fa57a4d4a6c1ccabd4f6b74d5533ece745ef18eee519188a0b6ebcd7c0c
font_01_sfnt_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10688 bytes
SHA-256: 0fe9db09987fe4c4f28fb39c9f24f02b8d3d36da9bad5b2da01f84bb41cde366

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