Malicious PDF — malware analysis report

Static analysis result for SHA-256 429a0eb2618b15cf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2a13b5a6707f6cc3f7078115c02a5b6 SHA-1: 7bb5712bb93c46dab03323a44e6ef5423e093aa0 SHA-256: 429a0eb2618b15cfc5252c7aff556afd6ad97cb2ea433fe76c35c52349928ac2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with high confidence. It contains embedded JavaScript and a significant number of external URLs, suggesting it is designed to redirect users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, reinforcing the phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=adventure+time+game+wizard+apk PDF link annotation
    • http://icsbc.ru/fuploader/file/fevuxitoxazasofokus.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109092218291775.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/tofewilagan.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/sukode.pdfIn PDF document text
    • http://rld-carbon.com/file/wopaparekeze.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/sozepulabujebutezez.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/nituvowat.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40f737586---29329546925.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/mopisemiwu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/2718246788.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/69211834471.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/46084044499.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/xirufumewadizojud.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/33564543902.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/15243514876.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/16657777836.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/muzukowaz.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109052337128880.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/20860170400.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/62410922193.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/82963441259.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/xubixodafixiz.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/12798611509.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/pewalejabup.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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10788 bytes
SHA-256: 950e2bea8324f1a6708ed8d4387bd6e3234c1c0b3c1f9f1be3478d3ad80ec9cf
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 19200 bytes
SHA-256: 3229da7745f229fa9854fbd5cb944322f86775a39474425144d84e75a8906fcc

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