Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9997569b95f0b83…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 14:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd926524259b5597eb26b2c0a53de47f SHA-1: 5b7b342d70ed93692eb4dfaaf13683761ac994d3 SHA-256: b9997569b95f0b83d45c155772d4c2cf2140e146887439d795eab82dc739ffd9
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute further malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to copy and paste commands into a shell, a common tactic for executing downloaded payloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://littlepearlbooks.in/data/eimages/file/wenoji.pdf In PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/71441118970.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zigadugozizijoxifuxa.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/60264609510.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/59942463892.pdfIn PDF document text
    • http://wdnederland.nl/file/zikemerodi.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/kirovidebevejagimuv.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/puzafenezumi.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630714400.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vesemisutolajosapuz.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/44052777367.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/88359773976.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/povukaselarazefero.pdfIn PDF document text
    • http://hanleyresources.com/images/mafilokivofaliviwirilor.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/22270700887.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/37858962536.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/kuseseva.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/pixaxerof.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906134409.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6458604833.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dasowubegisovurajoz.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/37743450838.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb828dcd6---gopivoxomopazuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=redmi+9+prime+update+trackerPDF 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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 10640 bytes
SHA-256: 1f9d1c8b1e53518a20d9cac53f2ef743d0ec1ff1b1689351db238dda2915418c
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16804 bytes
SHA-256: 1dd3ae5bd0bbebb09f5d78868640e9a736e5dce36ae117ffa12200a8ff4e76fe