Malicious PDF — malware analysis report

Static analysis result for SHA-256 6182765bc5bd9545…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 11:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 288b632d8aaa3b4aff017ce785d2312a SHA-1: f1f056e667f4aa8111eacd048e81b8dafb7edd4c SHA-256: 6182765bc5bd9545c13b130d85da13893233ecdfd37dea7e31837003e901e962
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

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 https://mashtalkandil.com/userfiles/file/tutaribipidegokelo.pdf In PDF document text
    • http://hyeminshop.com/DATA/files/jidabubupurebuboliw.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/23892985904.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vozabegilimifepoxakeradam.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/94289272.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/rufazobovizoravoparinop.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/kedig.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/wurexivumuzakifoxaganatat.pdfIn PDF document text
    • http://hidramaco.com/files/files/gamujin.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/donojubavi.pdfIn PDF document text
    • https://terracell.pt/images/file/6313469095.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/xiwog.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/mixesumepapajez.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/17302638723.pdfIn PDF document text
    • http://dhf-china.com/d/files/kixirabebusewira.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192687268316.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52314338955.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3f037586ac18956133755172ad72c7d7/44115848754.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/63785277684.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/rupozujowimexuxogano.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/26882852173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+hero+academia+season+1+for+freePDF 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_off0000af76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 10756 bytes
SHA-256: 09e3393007e2968637975c908987a455287fee660381454784969c933ae4017d
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 16852 bytes
SHA-256: e3e55e64edc7af11c403bf33a6980451234edd4c2998ded94399eae24a97d08e
font_02_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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