Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e4befe4b1e378b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 11:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ae99834f6a49e1d7989d8f8504d59a8 SHA-1: 1fbc19c3da520687a06b91636086098fcc181492 SHA-256: f5e4befe4b1e378bbfaa821ec0b7b9aea730854624bde08f86018cdfa432c5bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are typical of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=change+name+in+hotmail PDF link annotation
    • http://stefanourso.com/public/userfiles/file/82279153988.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/11610288303.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/35030077925.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/lawuxopiromisiferi.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/43353843167.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/11752795470.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/15581031792.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/99107350904.pdfIn PDF document text
    • https://t2sc.me/userfiles/66607708671.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/nijixikupano.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4c335ba5c6bc240b6598c8954c52ebed/64806519400.pdfIn PDF document text
    • http://k1a.ru/images/files/file/rowufiluzumitokonudovijo.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/83313331061.pdfIn PDF document text
    • http://wuchem.com/upload/files/67542026782.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/falonobagepezefo.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/3337880387.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/fenamidiwu.pdfIn PDF document text
    • http://meta-min.com/files/57701399149.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/18392640913.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410de11cd11---penasisobisakupata.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wijizerib.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/73390780470.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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10316 bytes
SHA-256: 834f07a49a10d13007c5ca21a35f3a5c7faceed667b98c7ae9246f83c260673c
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 18776 bytes
SHA-256: c4fe47ecc45b365130b61147cdbb9d6f2dc30270eb302fcec32376b646cd35bc

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