Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad16ec05acc5508…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 09:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bb8cd7f4f7ba6deff2bca48b5a269a7 SHA-1: e3d000febf7874db87909e68a2ae6efdd0817647 SHA-256: 3ad16ec05acc55085938fe30dc1e2db30b2054f0142ac1b2a5a2a26d127f8e2b
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 host a large number of links on disposable domains, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=free+spyware+for+android+phones PDF link annotation
    • http://technimexvn.com/images/ckeditor/files/72703711968.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/18468582632.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/fobolakagifekaxizupuz.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/34715996426.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/30556286397.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/wobapemuwoka.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/vagoxade.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lesewipugirudimesuvo.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/50613068543.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/73132975060.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/54597340341.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/80750307634.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/ronufolivoputit.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109102002037759.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xufanofisegiladewef.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/93893742583.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/86310105725.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/82489947083.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/54297901569.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///54639249013.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a43f0dac---18523318698.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/72192125369.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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 17620 bytes
SHA-256: b1d2ff980af4c9f97e28f88a069b3a4ef862827fa6d5e3c01087b71405e1aa80
font_02_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 10628 bytes
SHA-256: 689e0075eebe135a6160af5b34adafc8f118c511928d6fa98f8740c0014baa84

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