Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74dc1bb4163b0fa…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 13:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bc87faa6f0b5c42b6f3143561bff54c SHA-1: 3c09d46db856a3e08c51795dacfdf8811fec2298 SHA-256: e74dc1bb4163b0fa53bec73b2b786b41bed894a3b31d834b80400cae2c4c4fb1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://coretry.ru/uplcv?utm_term=how+to+hide+some+photos+from+gallery PDF link annotation
    • http://eraldocomo.it/userfiles/files/falosupusukuveguzege.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/68261480891.pdfIn PDF document text
    • http://all-premium.com/user_file/files/26932808647.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/25226455993.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/83805646155.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/36268880896.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/bazibirat.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/zonazixavemabadogofexaj.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/zituwiserowo.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/28034268336.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/90135522676.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/42702415161.pdfIn PDF document text
    • http://edeins.com/userfiles/file/7516096359.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036b7e3b39---84707459924.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16133961869fa5---93160365220.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/27208691940.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/506057985.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/fugomo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/96035017598.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/vuxeperobetafalil.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_4FC1B0BDEEF3006B.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xivanaralemowo.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/nugugaseb.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-19/20210919110314867175.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109210712334009.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/19642272169.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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 11032 bytes
SHA-256: 0dfcecb742eb99f8d86042b586ca0eff17d791d487850bb6bf14cac9aa7a84e6
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 17444 bytes
SHA-256: c5a5dac7243677e753f21b5c6a90f896e0d40f6dd0820c04d238008d43b56a23
font_02_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1