Malicious PDF — malware analysis report

Static analysis result for SHA-256 688ea102eb125347…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 19:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: bb3e279c4814e01a01d5140e8ef995aa SHA-1: 5f6a7f33bfacbd8b9877fb6c5db5301801b5f2a6 SHA-256: 688ea102eb1253475836f993c45f296ac435a93db8fa25fab5f088d7b0f1a4a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://hotellemaritime.com/hotel/upload/files/juzabefijemaga.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090522135847.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kafipamazi.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/4431174292.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/mokekanipapapuzere.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xawuxizavaze.pdfIn PDF document text
    • https://tpk-m.ru/files/file/12216324086.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/suvoxomizege.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/bubarubefa.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/puvasosudukopudijipabaz.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xelul.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/53683207407.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/razaz.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/somud.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/poxolilejixudopop.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/99084027373.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/2570686498.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/zotegetomufani.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/39919341455.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/38737378721.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/38992437733.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/32755026303.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/77259129191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=champion+soccer+star+2020+mod+apkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 18284 bytes
SHA-256: 23faa20797b60cb83ccd8d11a6847ba7c7b2170c2565dd74447d4d305f4609d4
font_01_sfnt_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 11096 bytes
SHA-256: c9994442606cb73cb3ce0f46d9175bda823d3cc53faff40bc43d8f75cf6c0c6d

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