Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c7d43e75135d32…

MALICIOUS

PDF

83.9 KB Created: 2021-10-05 08:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00e088849734af1b9ef8192ad97052b9 SHA-1: 0936b4e91cd21fa69ffb7ed052229942317f99c0 SHA-256: 54c7d43e75135d32b03bb6a15c5f153d8cd1a936d824eed32deabc59cdda2c15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external links, many pointing to PDF files on various domains, indicates a link farm or redirection mechanism designed to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://guruamardaspublicschool.com/userfiles/files/66955105470.pdf In PDF document text
    • http://yanartextil.com/firma/files/62891330307.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tilepikikajatulabi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/96501898323.pdfIn PDF document text
    • https://ms01bet.net/contents/files/vuniligopizirajenoji.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xubalokonawi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/10045763463.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbed5eb2d2d782c2a7b1368a90261/bovejezil.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/27746515331.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/gufemufogilamogukegazafi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb8997bc96---20265865161.pdfIn PDF document text
    • https://maria-galland.ru/files/file/99969385285.pdfIn PDF document text
    • http://naviway.su/upload/files/9339421119.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/kisexuwinozomuxikizu.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/dedonogis.pdfIn PDF document text
    • http://client.diffuse.info/files/47624651401.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/92842057046.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/puxadedo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/37522538725.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sexabipof.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/10896117749.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/72996061812.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/gixovexesejekewuvegegab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=steak+marinade+using+soy+saucePDF 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 11048 bytes
SHA-256: 470fc3677d31799c7c3e083f08797b6a255f41b77db355484c7aebd6b7a1faf9
font_02_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 19844 bytes
SHA-256: b4bdbcf3224c57dcf236fdbb1921b7d5b30411e74a91bd87be6bda7d303c8ac2