Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e1ed610f325787…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 14:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0656c45ff001fa4e2ea74e87ed81dd11 SHA-1: 47f281cb9e55572da006940056f7748c28994b54 SHA-256: a1e1ed610f3257877504ae7b01f49ea733bf7beca570afc66e1c128a90c64b9e
142 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 ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening or interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sherwoodonionfestival.com/ckfinder/userfiles/files/81810008375.pdf In PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/joxoxilikulubutajete.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/41765400719.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fb864578---kikimi.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/11358651307.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4accf793---77790958682.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/vuguve.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/98983142025.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/diven.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/30481992233.pdfIn PDF document text
    • http://yoron.net/up/files/36674513850.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/xijigawuravafakijek.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jowuzotigosupolonuwojop.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/95428848788.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/35091056749.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gofununabiv.pdfIn PDF document text
    • https://basisnomor.com/contents/files/71712574320.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/53939105010.pdfIn PDF document text
    • https://fototipia.hu/files/files/jomuvidukoto.pdfIn PDF document text
    • http://irths.com/upload_files/files/54916430642.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogojujejojeparag.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zegipubofof.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/9109896893.pdfIn PDF document text
    • https://invision.buzyhub.com/files/67175768975.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/7364951514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=galaxy+font+style+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 20600 bytes
SHA-256: 10f961ccc83499b29eb29bc0d3b5f9793b73cf4df584719baa29db65b36d5664
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 10504 bytes
SHA-256: 896ec33ec55e699e179d835cfc27b2cc8f4a444c0060b4913da14cdf2f63fc50