Malicious PDF — malware analysis report

Static analysis result for SHA-256 428ee037ed6a4edb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 10:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4652ebe86d8aeab51055fb2ab3663f0 SHA-1: 9d5828d8d9d4be8c6bd40ae104dd897bbcd4d294 SHA-256: 428ee037ed6a4edb176db607d05239a8f80c794fcb342242e006e8e7178bbfcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=stock+rom+download+for+samsung+galaxy+core+2 PDF link annotation
    • https://datawire.gr/files/files/xofoluzoruw.pdfIn PDF document text
    • http://lachina.cn/upload/file/bujavoxuzexizonowofi.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xajadagatixumewadeven.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dokekesuva.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/67559914591.pdfIn PDF document text
    • https://timminsrenovations.ca/file/vW78r5BYPGDkZX47.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/40777910227.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolasesoviwinosixegu.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/1964057456.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/desefujukotexexo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fe03466e---zuluvuwenuxiz.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/90983794954.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/31553020747.pdfIn PDF document text
    • http://hanifeugur.com/image/files/kefedeserodojapajadumoxaj.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/rimix.pdfIn PDF document text
    • http://17njl.com/userfiles/files/tazob.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/fariponumax.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sozuluturisonamebiduzep.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fasaxezotemoxedoweris.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/juriki.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b25fe222e7209e52ed772fb612dbcb65/morolobilotig.pdfIn PDF document text
    • http://strahyi.ru/images/file/sovefazigone.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vusimogizox.pdfIn PDF document text
    • http://soles2walk.cz/data/file/62854332682.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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 11416 bytes
SHA-256: e87465022e0d624e61bc07550e887692b747acbc44b92a4c64f365d5e1eecde0
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 18032 bytes
SHA-256: ad5a5260e50ad66175a713df10916fdf2e386f2054fb3aa4f8b0e857776b1a6c