Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a1f975ca97156e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 06:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42966cb875a3bcc869f535be8d8e1951 SHA-1: 6c5ec828c24cb373fd72b24fd48fd65233bb0b9f SHA-256: f6a1f975ca97156e17202f5c879c3d1f2c74091d044fceb7272e2c64b762a8a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://daearesort.com/FileData/ckfinder/files/20210908_BCF0824CB79D0550.pdf In PDF document text
    • http://1night2day.com/ckupload/files/81304810968.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/zukaxurixigazanapivazuv.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/51533965643.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zudiwuzavofilozopomu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nowuk.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/34839406500.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/gasusune.pdfIn PDF document text
    • https://regenerateacademy.com/file/33190079462.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/20597547878.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/setoponalen.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/63037381928.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/24883825658.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/39267169642.pdfIn PDF document text
    • http://thuaphatlaihanoi.net/uploads/files/tufupuf.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/talokisuv.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/vivepekokuxulo.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/71863542449.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/94668716291.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/79877972971.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/zejebogidajilufajenob.pdfIn PDF document text
    • https://jin-ji.com/upload/files/98202665180.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c09a49770456947d378070f947ccfb49/leweledixusuvidilu.pdfIn PDF document text
    • http://shturnev.com/files/foFKED/file/79062953498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=odontologia+comunitaria+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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 18756 bytes
SHA-256: f98f9bfda3da8612bf5d47e1af5b401ad19a6452eb9f7631cf4d08d90289f40b
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 10788 bytes
SHA-256: d1d7422963c64a3a3b383913b07a74e3b049873d2d72c6ffdb5bd974ce0ec530

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