Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f21b3673da34c18…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 16:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5dd62836710e6dca033e1dcb4796a11 SHA-1: 0a279e91e3d97508dea973317b16a7384a9b8022 SHA-256: 6f21b3673da34c180d166f272a188c74ca3d8d06f2fe0bc318d6a27397df601c
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, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to these external links, which likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ymy-tea.tw/upload/files/vitumupipazabetekevo.pdf In PDF document text
    • http://ayrh.internet-match.com/upload/files/95142127931.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906015759388920.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/lorufogofi.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/geremubizodibag.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/dosodujupabolutalesod.pdfIn PDF document text
    • https://uudanbury.life/files/file/papometuwuxuvamumamiwo.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pikevenifedegosozisa.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/nesurusuwesezejugiguwoxu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fijazitezutewagufaxipezug.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/40532544748.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/zidasukewigeretuveso.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/lebuxasosu.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/82147462885.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/xebawemozis.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/76943295831.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/kopaniguwamuguxuv.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/fagudomi.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/kevazadoloj.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lunuw.pdfIn PDF document text
    • http://jucal.es/images/file/39391368902.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/93463284064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=advanced+settings+chrome+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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10816 bytes
SHA-256: f0df7312be25ab62425bca9c35d291aac95f3840ffee5fb46c183c4ebf3192d4
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 17936 bytes
SHA-256: 3417efe6ecf85879f8c1c61bc9ba939a71929eab90cd531e113edb899ea2b323

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