Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8d4d7bfebecc41…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 02:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 036d6ea26ab61c52a191255cee1e62bd SHA-1: 2beeb94d344b54d9a903d7333ec14acaa5a92e7c SHA-256: 5c8d4d7bfebecc41540e1c694e8b6afd4d93b7db658c36b5f9e0f93b7972802f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external, algorithmically generated URLs hosted on disposable domains. This suggests the document is designed to exploit vulnerabilities or trick the user into downloading a secondary malicious payload, likely a phishing or trojanized document. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=using+chain+rule PDF link annotation
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/17720883693.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zopezi.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/jukalasapom.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/36175785889.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e60ca906af01fe6fdf027e776b6e9086/pobofaxosonamat.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/99882540038.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/zagakudixejetuj.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/16389323132.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/kumigo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jawagokazirimixafara.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/simevoxobojin.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zekoverezowoxig.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/78773692821.pdfIn PDF document text
    • https://andana.us/files/files/nituposun.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/madirola.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4ca9016391d3e289730492e615cfd4de/80055792439.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/babuv.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/bevimutekazup.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/83081451106.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/62230274818.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/56179570461.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_off0000bded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 10400 bytes
SHA-256: 9e35a008d9071531c64cb7324e588f43a86f450a59e7f1eca3a0b7d05921b8d4
font_02_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 17252 bytes
SHA-256: e1cdeb0fb562a7d1941bdf8fd5a096b0f7063ddbc59aff7d4048bbfbd40409e4