Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54cabc18253fb16…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eefeb723871167cd3ed38e8d015cab2a SHA-1: aa0767207315f1fe9fe80d3f35fd41be7301874a SHA-256: a54cabc18253fb169251ae483648d193d9783de31a45f41b36c77b8b9b16e29d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of embedded JavaScript and external URIs, combined with heuristics for a 'Clipboard command execution lure' and a 'Visual download button lure', strongly suggests the document is designed to trick the user into downloading and executing a secondary payload. The document body itself is heavily obfuscated and unreadable, but the heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=fonts+for+android+zip PDF link annotation
    • https://mollis.rs/files/xejusafovu.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/govuwekimupemekova.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/wiwiwe.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/tetusasoparokawedefuwesug.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuwobebak.pdfIn PDF document text
    • http://abwessex.com/uploads/files/faretidowupuw.pdfIn PDF document text
    • http://preiss.at/upload_files/files/89853585597.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/nuziforil.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/22177943787.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/94231356901.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rudotexal.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/37148954572.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/21421581963.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f106badd45---niwudo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/nozorekosiguz.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/9011066727.pdfIn PDF document text
    • http://okvin.org/userfiles/file/xasokufi.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/74141282180.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141381c9d8c9---28935187343.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/68754557230.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/50757347261.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/zunijojebirafejelataniraj.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/94715029547.pdfIn PDF document text
    • https://lasanisports.com/files/fadoki.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/49480934557.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 10352 bytes
SHA-256: 98d0037191c39277580608a90f11b7a57c33e6471467d81d043bd9381d8dfa01
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16992 bytes
SHA-256: 38bdcb6431623031ef99558d45debdf1b97b4cc2a8ec013c2adb5a3a9b5bc109

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