Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a09906add9d67e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 16:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d137e740b13819f9f3f114be1a7db1a7 SHA-1: 9cc48ed61414bbd3414511e0156bbd74d71fd5c4 SHA-256: 22a09906add9d67e1b1a965544cf5ae07a962255ed7f148298cc28b10ec81a21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://kokomanis.com/contents/files/74465546639.pdf In PDF document text
    • http://pmrs.ps/userfiles/file/kafuvef.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c15ntdo0lt3eckmoo5uh9chro2/62912549646.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131633dc7e05---82901471222.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wovofuwukarujane.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/6913880595.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/75233784451.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/kobesovovejujonuvoseso.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dakewisix.pdfIn PDF document text
    • http://kbchina.de/upload/xazanibawusigukureveb.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/pilunakumisejesewadadi.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/61565155326.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/21448282212.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/061415567821.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/pavolidasukejas.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/79851871597.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/wikegenogonafegabopi.pdfIn PDF document text
    • http://taociren.com/upload/file/210904215034400126lgm38v483x7m.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/runulegekovix.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/taruxakikaketek.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/miwowilidomutugoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+turn+off+auto+wifi+on+androidPDF 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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 18320 bytes
SHA-256: 277cc82f01e5979f7c63565e62caac33696e492a2d3fef54bee04591dea98d4b
font_01_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 10176 bytes
SHA-256: de7a5d715fab76695bfa15c73186dd603408329c0803ff399da84732229a1edf

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