Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16f775630b9d617…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 04:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80d4aaf2e96d0cd0bcf7a023d3ecf805 SHA-1: 3a8477889a3d784c6a44f88789fd1de91f15b227 SHA-256: e16f775630b9d617f4d9e2387f298e21e9d721c2c872c0f34296a4401e655214
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links pointing to disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://studiorestagno.eu/userfiles/files/16635040996.pdf In PDF document text
    • http://xinyuemu.net/assets/202109/files/20210916203012161525.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/kavuludowovevixatufuro.pdfIn PDF document text
    • http://wwsm-us.com/files/file/25341302385.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/getipugotisiwejolu.pdfIn PDF document text
    • http://packamate.com/userfiles/kufavizimisuvadasoxejuj.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/51839250889.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/78152755913.pdfIn PDF document text
    • https://pcetravel.com/files/file/41118983406.pdfIn PDF document text
    • http://iscelenie.info/files/file/nolawusikoduruxuwudugape.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xolugenulufegab.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090804122339.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca035a74e---58433140956.pdfIn PDF document text
    • https://csodamalom.hu/files/files/sonin.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zajefag.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/63170095829.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/bisosif.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/27907509830.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bumagimugolati.pdfIn PDF document text
    • http://emaaravm.net/upload/files/fodarebisiroxuduvabo.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/gufomewege.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/lusavitod.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/93884467988.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/211055194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+pyaar+impossible+full+movie+mp4PDF 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_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 11144 bytes
SHA-256: 54b8e5e569ee6fc58fe949702b7b18722f6e8a7e1c400d5496dc5ce2c8f42b8a
font_01_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 17684 bytes
SHA-256: f34bfce49bdb424dba1ab91c073fff8c1928cc56151e60edfffcd76f7a6b9f6e