Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a67db5b082533c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f89e7d09101614e2f43540667e074878 SHA-1: 031f2265bbaacdeb26811df6d24499d3d5d2f2c7 SHA-256: e7a67db5b082533c5ef9ba34aa4b218e57802e1ea0a22eb0bf9f6b7f9644e5f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=telugu+film+news+websites PDF link annotation
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kumurewokilajabekofib.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/eabd99c9156b66be18ab59cedd861807/zumepinigoxoloriw.pdfIn PDF document text
    • http://honda-vo.com/upload/file/61577396024.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/nosefavejasobalusulapo.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/juredewofakifinejukum.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/xodivawegavixadagusudirit.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/17586197535.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5c172e0f6cb4baf6cb6addc9cd58a5be/nizuw.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96377647616.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fatalapenedoj.pdfIn PDF document text
    • http://lyshiying.com/d/files/vuzirepirutejunik.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/52085551910.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bupijafatamupefirokofewu.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xetefapojeg.pdfIn PDF document text
    • https://inarsindbari.org/uploads/rotulaputupatixo.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/sijixiwetanotebonizumid.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/15084720807.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73644289015.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/80452656521.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/wafuzisaduk.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/fawelibazugiketuduko.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/22163526968.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/jepale.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_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10464 bytes
SHA-256: c5ecc211b64693ec4635c03d46296f8158422838ad8a93c7886c302e7ce1961d
font_02_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 17548 bytes
SHA-256: 163acd5b7dcf29987dcf87a7c892d301ec30b9c8acc381089330d766036f6afc

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