Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1b666f3399fd6f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 07:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a5d7ba40c2b3cf27ee1e8f2ce704732c SHA-1: 2c1b20e3d5547b939e513c02e67c1a710578f4b1 SHA-256: 8d1b666f3399fd6f83241660e01a7939eb914f26c673929e3371389bae9d80cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a large number of potentially malicious sites. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=mobile+app+development+for+ios+and+android+edition+3.0 PDF link annotation
    • http://abworder.com/uploads/files/julojuzavenob.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/gonaga.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/fevizuwureteraratijo.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/gatovazisosi.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/powuw.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/perosi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/bapamanosirid.pdfIn PDF document text
    • http://dentali.cz/files/files/pejabuwokegijowemesix.pdfIn PDF document text
    • http://www.bash.cl/media/file/24989366430.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///99717488415.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/40622150609.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91659104778.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wolezibumarosiled.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wemebetamebowivolexo.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/58693684753.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/gitufadijimofupeluzumo.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/75087289671.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/82137541705.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/gepipipeni.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/poxuwasejixirivavaxatana.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tedopasiz.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/jiserinu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b9tjrdssu3fn39sd0q95rgeg8i/kupaxitikofelovi.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_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 18312 bytes
SHA-256: 0b1ad3f5ce771c1016747c793b8304c06de93ffde7a321355edc5e5c7a552bd4
font_02_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 11216 bytes
SHA-256: 573c2d945ea9700742d1385a72c04dc3a654b18709c7528f1c4342893fabda5d

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