Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a66388aec4ee4c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 02:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a55d1dfa9903e5a6aee83adac7f31e0a SHA-1: c04418d4b0626a2713a3b60b90147413dff6ccef SHA-256: a7a66388aec4ee4c760e03fe267e5e9eb9bcb1e32399d6fd33b26cf7a1fc42e0
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. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, likely to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aguito.madteam.net/ckfinder/userfiles/files/piwusoxele.pdf In PDF document text
    • http://svazekobciorlice.cz/userfiles/file/92642023011.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/62148362950.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/87110901478.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73044662367.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/pimitobawabezopovujazu.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/xivika.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/13313886074.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9441507072.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2b4c1e80---80960977041.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/kogavivuzefisuxumi.pdfIn PDF document text
    • https://noddy.nu/images/file/75820134862.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210803065237.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2ef470fa1c904cd30907bbb35a65a63c/vuwejivujubil.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/72098951218.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/010906273995.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/mogunojivigipofozo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/77952138485.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/37835057786.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/tawepo.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/vibexazajazot.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gusisazaxilexak.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/tasitixebutixivirasumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=book+reader+app+pdfPDF 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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10128 bytes
SHA-256: 657af77ed8f57ee43cb82dbd021306d403e70882b402a8f8c5e88faa561991fe
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 17916 bytes
SHA-256: bb39aeecec4eb249b30b226de2d0c7eb3e614f7ec453b7944dc97cfd26ead096

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