Malicious PDF — malware analysis report

Static analysis result for SHA-256 b502a00df2e96ec7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 05:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a3a75d8e91edb644a866c5362110f24 SHA-1: e5db0d1da2070255af37cd25e587bba9c027642a SHA-256: b502a00df2e96ec769605cf5b4a5d1f1948d64c9b16f2f4e5e7f28afe2339a2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a1535e44aaa0b422ba54dbdbe341dbd8/riwuguvizovasoraji.pdf In PDF document text
    • https://securitydm.eu/slicice/file/25727465473.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b32a07a6---4581157102.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/19947292371.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/7434240198.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210910_BD6ADD7EB82723B4.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/demezexavupilepavim.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jixikenepuvanepijuti.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/67198554782.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/sunedusezuli.pdfIn PDF document text
    • https://negaratoto.com/contents/files/38102725544.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/lijozifo.pdfIn PDF document text
    • https://jobtiara.com/files/files/8512874597.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vemirowadofitiganamipom.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/molumirogabuzudonajolus.pdfIn PDF document text
    • http://sparkpro.lv/content/file/91529229553.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/pafenatuzoduxepapesameze.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/11113372086.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/43886150460.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/wixitofonadita.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/69316260423.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/18900948281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=online+radar+mod+apkPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 10404 bytes
SHA-256: d59366954464b0e7d87ebb2c201552fbf776808d1d6922f74f592c14cac43b6b
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 18612 bytes
SHA-256: 93f74d72117fb574a654ed886edbd1ade826ecc2d6f45c73ffa3e18c406c5988
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1