Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eaf2ccfb899488…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 03:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24ef1dd2d43cbd0c3327c2b77f33ea4d SHA-1: 742b3cc22113cf099a9e9b9fe2f0cdb3d3a69675 SHA-256: b9eaf2ccfb8994887ac4a2e316739e6e8e3a481c4245d055e159642a9346ee44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://x04ydivan.ru/userfiles/file/2505833411.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614685c721a6b---6384760686.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/jubosebigejuluwumefipeb.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/35834166255.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903032648.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142876f123fc---85024411300.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/40306148767.pdfIn PDF document text
    • https://southafricapools.com/contents/files/98967488868.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/kemeguniwaxi.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/26812281203.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/wojexinulidazalop.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/87803070453.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/zitamebo.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jabokasegarutivupibugune.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/sarujipegamivukexad.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bisobafufat.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/lemuduxodenuripibesuf.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/93796448436.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/vilal.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/newonadovizozodegoso.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/10538369993.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/nekofunaw.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/42146190734.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/wukizexesovobisabus.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/talenowux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chromecast+android+hotspotPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10764 bytes
SHA-256: e740662b24e287c26acf62f66d7c531427e1f75d7d69575e4dae5533037f7deb
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 16820 bytes
SHA-256: edbead5c467d7731f4c19df01eababc8054cd723df5f983c4b8c673567d22f5f