Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c934aab7c59ef2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 04:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa54d35899179c09a8b3709a9492f9e8 SHA-1: d7867df79d0a16e6918813a08519eed5fe4a9fed SHA-256: b3c934aab7c59ef2de1a358fb18d1ef8c8ecde332260043a2f270c97020b4232
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of numerous external URIs and the link farm heuristic suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=android+ui+controls+list PDF link annotation
    • https://elpollopaulino.com/cenavarra_userfiles/files/vazafufubisonasujiroveg.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zipotezolusironemezuzezu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/98259742844.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f2d72128b25916916b1c2c909f5151c/dobokejojira.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136d58d3f7ac---wanatolavefaka.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/bigexekatofileb.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/kanigipareraxize.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/tafegaxilisada.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/69102512132.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/pufutaxetubi.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/vikidopa.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/wipodimesapewetula.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/87090809297.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109071125263451.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/38188025647.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/41477273898.pdfIn PDF document text
    • https://adikkedua.com/contents/files/sikesuxage.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/41474724477.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/waferurolurogodilok.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/lusuzametusimag.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/kodinusasimazujonevejuz.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/17431644644.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/37294457695.pdfIn PDF document text
    • http://ustunongel.com/image/files/baromokerewebavoruze.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_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 10148 bytes
SHA-256: 7117f1f87025ec3985a22e608b5ea299dd5b28fe6a2b109cc0406e8774a527c7
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 18172 bytes
SHA-256: 4e7c39d164dbf18cdbd04912f0057c6ab3cfa795c63ed7473745eadb93df224d