Malicious PDF — malware analysis report

Static analysis result for SHA-256 6366e10737b44193…

MALICIOUS

PDF

82.9 KB Created: 2021-10-12 02:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 751f012c2c3bb2ae6a35b33d7af72704 SHA-1: 5e7011f4e0a6e7024546b52a67da0ede601d7de6 SHA-256: 6366e10737b44193f69152fe54938665f242e17d2b9fc8f8db94ef3a278692f6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2651b8148---96896424919.pdf In PDF document text
    • http://sungwoo-n.com/userfiles/file/gesotoxiwirivevesaxenulu.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/lobigekiselofagitilugilab.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/14787267343.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/57726566993.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80773287428.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jumojobenonejowosi.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/duronelojakewirogolovoti.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/32562881266.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/81580889540.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/21240839028.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161620e5644031---rudejubatexupusovas.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/vafejapifuvufowirapiruxit.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20211005_051318.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/gonupiwavob.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/ruravaxovavado.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/venogorira.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3939a9b45---13612920113.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/23848788148.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/dudixexudigidafesoga.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/nabekuzufuzitapizifozexup.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/14259345041.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210920100702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=helpful+expressions+to+avoid+communication+breakdownPDF 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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 11356 bytes
SHA-256: c6fa403e0020ae540a93db2a3e6b708041ea2f90158a86031922b15bb53c0d11
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 18660 bytes
SHA-256: d5115fcecb3e9ba8129aa1037ba3f4533d59b2f46d444bab3f24e4c17f4a06c0
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1