Malicious PDF — malware analysis report

Static analysis result for SHA-256 236eef6d78497378…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 08:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06826bb8d9ab657e5227e0f3e3e24134 SHA-1: 0fb140255088e1f273bfc56be832873843c58b2e SHA-256: 236eef6d784973787d8709d27e39883ed3669b19587b0d2ffd3597cc4478c4f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing lure or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adb0b065ea---supubojufutalude.pdf In PDF document text
    • https://afgventuregroup.com/cfiles/file/61800326147.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/dowusovefewevet.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9n4fb05lff30ai96rd06vj827q/98432878508.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/85803844998.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sulorewewajazegugixixib.pdfIn PDF document text
    • http://nova-auto.com/upload/fisubazoxafijonunonegaj.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/luragamerovazokodozo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/92964107900.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/gozusepesokubetepokar.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/ramokipijatidevefirupilan.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/86481017747.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/25892494034.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/84355823047.pdfIn PDF document text
    • http://uniqsofttech.com/userfiles/file///tobevurimutonijuri.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210925180333.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/33252206655.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/88733994039.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/somuzerixaroxagazikedo.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/52505595738.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/wavozum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=quickoffice+for+windowsPDF 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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 17404 bytes
SHA-256: 1ccdbf58d4afdc5a13a40ca8edd6df183cb2e749155beb212afd8f6642b51a5b
font_02_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10500 bytes
SHA-256: bb3f0089eb4218c4d511efe665e8949f95a0579c27b05bc690e36a7e31372c87

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