Malicious PDF — malware analysis report

Static analysis result for SHA-256 4225b261ad701f36…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 00:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e41d818b061c338d83062a36a65b2f01 SHA-1: 4a6ca22b1642d3a744e1a1377eea51bffedfdc27 SHA-256: 4225b261ad701f368d62eb73c1a154d240197eedae8237088de380399579c5a4
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=sasol+birds+app+for+android PDF link annotation
    • http://shimamura-mail-order.com/userfiles/file/wufopesisewolij.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/sokibagugudonunadaluto.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905145505.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/28446272458.pdfIn PDF document text
    • http://bibikid.ru/upload/71497148709.pdfIn PDF document text
    • http://videlec.be/ressource/file/21252366243.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/1206081314.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/vusafegapixugup.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/79813668789.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/83546605200.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905054809493.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388df76aa32---20881451379.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kibefodogi.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902233756881375.pdfIn PDF document text
    • https://basisangka.com/contents/files/xuvujimi.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/mupuxut.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/29845947388.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/wotilej.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/63116184029.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/91573446317.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/satowasetotiv.pdfIn PDF document text
    • http://rinsacars.com/files/others/sogodona.pdfIn PDF document text
    • http://tfforming.ru/d/files/58532093202.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/45359280033.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/nozilejupukij.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 17748 bytes
SHA-256: ada9fa054bbec02a0718d1e29908301b8a7a501157fc43eb58e6de0eafb47e89
font_01_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001343b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343B 10476 bytes
SHA-256: d597f0758350b99c28ede823cbbcce4871c8d60b3e777cedd929899e8038fd1d

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