Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb0e8aef7675e36…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 18:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 890c0776798356f7f909bc597aed3c9c SHA-1: 22a9f26752d251736929a34b9efd91d1f62349be SHA-256: efb0e8aef7675e369d220f602269813f834ed23713606250991a65c5dbde0930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or spamming operation. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=bloody+roar+3+apk+download+for+android PDF link annotation
    • https://agrilaui.com/userfiles/file/jowonew.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/49990032192.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/vutumagepinufoxak.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/29142970179.pdfIn PDF document text
    • https://alkoplast.rs/files/98239010341.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/pusukowowinovumez.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/benixejebikabawatifa.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/54632914727.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/nezuvenomugun.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/manarebelewepeb.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/bepuk.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55972337539.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/kesusewajeginajurazidu.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202191114429537.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83764429909.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/nixizogu.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/97909368587.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/69494227047.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/70928405449.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zikufov.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/tojasejoliwejilo.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/99301965604.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/78106827039.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/lovorelegudenak.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10612 bytes
SHA-256: 5c1663cfbf5ef50ba35124513dbf9ad1c47a992f86e7a6c1cc300174b2b08147
font_01_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 18984 bytes
SHA-256: 33fbf582d3f254c6fdcdfef8d3356b34445d80aba95f108c07d947dc1fd5a644
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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