Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b6a466c33095f8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 15:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e495a33a793dcee02e17ea14e9bc9c9 SHA-1: 53b4bc501d477dff233baec9c822a7fd04ed0ab4 SHA-256: a2b6a466c33095f8a036163ea2bf94c3e6e8e1bd641b5170dd327e56c960a956
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ba4adc4d5e1284c654fca4b28d9229a7/tanikitu.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb63bdf52a---memaresawezuwunub.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/gajodapuju.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/68878983693.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/pixovezulijewukesumopopaw.pdfIn PDF document text
    • http://gibisch.org/files/files/27377581422.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/bopivuvixuxad.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/fobezokedobo.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/xajevefizobibet.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dotebujofolof.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/zevaxusibilorewer.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/gujotukigenujo.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/92154898223.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/57132541565.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wewifiko.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/17367980236.pdfIn PDF document text
    • https://vitanov.rs/files/kutemitimok.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/dadazesekevetoraroduzago.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/64141796134.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/69100698305.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/kabixonofigifovefavit.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/61758841127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=moto+racer+3+downloadPDF 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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 10356 bytes
SHA-256: f3df55f2d01b1a6fd840c0a6aa4280d77d2a818a238093009f0fb530e583a229
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 18240 bytes
SHA-256: 4947c8602f56dfa25caf67df8002a41e3cb51829a5f282411e7189d3ffbae6f1