Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64d1478212f51bc…

MALICIOUS

PDF

74.9 KB Created: 2021-10-14 02:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d6aabc14c44b4f37f51cfbb5c2b3462 SHA-1: 60e0998cd8bff5b9b8d4d9907d42ad01a7dbde1b SHA-256: e64d1478212f51bc8d20384d76113cbacf3e7f44360c30b3c1ac5f7394c81aa0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to PDF files on disposable or unknown domains, suggesting a phishing or malware distribution campaign. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://kisito.com/userfiles/file/natosenanokubej.pdf In PDF document text
    • https://eniedu.com/data/file/20210914022100.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zarogujidukaluxedovedapuv.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/zijolojizukipuf.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/zupejag.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368740e2b93---sapijejunitufivon.pdfIn PDF document text
    • http://kondicionery-bronnitsy.ru/upload_picture/file/fewizap.pdfIn PDF document text
    • https://parkerboat.hu/js/ckfinder/userfiles/files/faxipodidexododuxa.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/19702246694.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/viwemedenarubepezodix.pdfIn PDF document text
    • http://rayanchem.com/d/files/91563488867.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210918150446.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/21485720793.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/38836936248.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/xodomadow.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/81029908694.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/vujaluna.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f491cdbc8---bigukowadagagabe.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/devuwunevunobof.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dowijidesigepawatiregel.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/17812489503.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/78450878639.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/xekabuzatodevujutini.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/sitirumadijop.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/22105261181.pdfIn PDF document text
    • http://hkalc.com/userfiles/69169491178.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=chromatic+approach+to+jazz+harmony+and+melody+pdfPDF 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_off0000beb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 17664 bytes
SHA-256: d01c0bc78cba65a417012c0d99696bccdaebfe811dfb5ddde5751fa67f520e9b
font_02_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 11052 bytes
SHA-256: 22b6f646deef073583ca0573f70914cb42f420196416dee82a9007afbaf5092e