Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50d7f790e7b6ec3…

MALICIOUS

PDF

91.6 KB Created: 2021-09-16 21:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fde47101a2f61a2086584ad7e03c18df SHA-1: 3a6c4a0449c6752738d554dea30783bb2e3444c6 SHA-256: d50d7f790e7b6ec3435f130aacfc325b0ca1c4431dae1d05cd4ea05b11ec3c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://termokingbt.com/ckfinder/userfiles/files/71922251733.pdf In PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/favedapelanuxexotatiribe.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/bekutafufozuzabobewan.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/79243540418.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xinoxigul.pdfIn PDF document text
    • https://salwangurugram.com/files/3441160819.pdfIn PDF document text
    • https://oasis-travel.ro/files/34437789428.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/77289678307.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/84719633287.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914175008.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/74916909386.pdfIn PDF document text
    • http://fxlcd.com/upload/file/nifeva.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/45431593104.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/dinavuzesanukirezobizuku.pdfIn PDF document text
    • http://cityfate.com/files/files/17661475960.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c116eb0e---zigugufabukabexe.pdfIn PDF document text
    • http://apex-architect.ru/images/file/ginamunuwojazajedibu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f6e527c8464589838f8b56aec2442cda/mojotunatuzawolezemarapo.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/xixadefojavam.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/91121692579.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/24625918645.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/30525609632.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210906152221.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/20278267613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+high+free+moviePDF 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_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10224 bytes
SHA-256: 92a066ec115ccfd11ad2ad21094b1d158b9b34233ee96b887e0448bb5a07e542
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 17228 bytes
SHA-256: a950d27ef68c9e56d5ca03712fccefb31c632dadea269d3027cb080a9fd73250

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