Malicious PDF — malware analysis report

Static analysis result for SHA-256 8108940c6c5deb35…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 12:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6f60b858e1f2b6824484fd169e40854 SHA-1: 5517425dddcf6c4267a108fcdbed4f283dc614b6 SHA-256: 8108940c6c5deb35fa75bf266d2417baebdb72068e9fc9489577c6dece3c27cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm on disposable hosting, indicating a malicious intent to redirect users. The presence of numerous unknown URLs, many ending in '.pdf', suggests a campaign to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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 https://newchat.xyz/js/ckfinder/userfiles/files/13281913483.pdf In PDF document text
    • http://minhanh.com/files/12314300716.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/97545217896.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/xexubagibipolupuzeze.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/nolupuzop.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/91813286449.pdfIn PDF document text
    • http://fitviewer.info/files/file/1813407857.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/woriximake.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwomekagiguwapexuzawoba.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/12673978927.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/2871432813.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/zojasitabifoni.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/33940744011.pdfIn PDF document text
    • http://ingore.cn/upload/files/jexuzatepovaxitujaxegul.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/vazosoku.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/1542348457.pdfIn PDF document text
    • http://talleresjpg.es/img/file/pifikinawutojifexinezu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/54285012728.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d718f670f33a7bcfa9eef26730ad8a97/80385123308.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/80373581993.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/nizir.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/guxewavivakejobefimas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=smash+cops+heat+mod+apkPDF 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_off0000abe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 10604 bytes
SHA-256: 332bfbcf1448c2a0006075dd62b6f0088347f52f81dd5f582777e900eb064194
font_02_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 14768 bytes
SHA-256: 6988fb8946aa494f1ff0b635b5cdd72fd8533cbc2f012e5d11348281b0e4b576

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