Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b54231c23eb3ffd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 14:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c67bf334639d3b7c0cfed7fb51f6c8c8 SHA-1: dee4d7b42c8782211c2b1e397cd3973845516815 SHA-256: 8b54231c23eb3ffd175ae79fbe94a48e68f1bfce7545dfe56301e956cc75d238
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=comment+mettre+de+la+musique+sur+un+samsung PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/12542431661.pdfIn PDF document text
    • http://teresachild.com/upload/files/nonebigumuxuvoxomit.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/44830462177.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/19998870449.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/lowiros.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/12215142655.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mcrhn1s94ugi1631bh15d0vom5/10829540855.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/80273848235.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b2487786---57648369924.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/38607798876.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/gulixoxuwak.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/79838895846.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/gekosixuwitebes.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/43206789887.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/kedonib.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/92674185069.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/45098556993.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/gitepiwaruvawepijalejun.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kagidebidaliwekedefuvo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/83481982804.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109190656073657.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/11805607189.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210914/16315947106130.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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 10868 bytes
SHA-256: ed3f58d8ccccd134fc2f93d1c2befa84f1c469d8fd6eea1eaf691c859b6263bb
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 20268 bytes
SHA-256: e0f57cfd7b59fa4b97d16f015bc28bc2e35bdc61cb07a1053efa9c14e4a3d056

Open this report in the interactive analyzer, or submit your own file for analysis.