Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3490e03eb69daa4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 08:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: babc30d25b88980b2ec8a48c4254111f SHA-1: 5e10133ff84730840349f83b2040b49f3d436529 SHA-256: d3490e03eb69daa4f368cbfb2df997806ec3c2c7221cdeb50967d46ff547eeb6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm structure suggests an attempt to redirect users to malicious sites or download further payloads. The sample utilizes multiple domains in a link farm configuration, likely to evade detection and increase the chances of a successful download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139efc9426a1---52493972482.pdf In PDF document text
    • http://slkuang.com/v15/Upload/file/2021914520407867.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/15168025118.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/82586893235.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/32436717779.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/46381577031.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/t9u6dmmuc84n0ps16gellkf545/95890559054.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/29900833193.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/zaluwowutonafigiwipoxuv.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111531447202.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/pezalutujepomojelejeriga.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/kigatoxagidosejo.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/notonivafotomorufeme.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/bowotusuvifuzenumosimoxik.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/konurasu.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/gekebaxalamozanovefegaga.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/12528093471.pdfIn PDF document text
    • https://iwistw.com/upload/files/46105522620.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bubaj.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/95624037783.pdfIn PDF document text
    • http://seto.cz/uploads/kofexegaxaneliburazupa.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/wujodofux.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/vovorobo.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/vokavexotugexolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+1.16+apk+iosPDF 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 10800 bytes
SHA-256: 8a7e4d65972adb0d51e37fb02d13d786919d1e4c50332fd3d658269114769aa8
font_02_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 18136 bytes
SHA-256: 9a5f8812da945ffc53d68f946242064f0a964b38b485701e82687903c57b43b0