Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e203509eb846d2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 21:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1d6ff0c9fffd4a17bb2fe73d05253c94 SHA-1: 18fa16469c0831c50620c0b86f1a14849c3e6e8b SHA-256: e4e203509eb846d21c8a012b6ce218786bb8a7bfba0db0dc0fe5a104ea21e476
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://zapret-rf.org/web/img/podborky/files/dugovawigedelolelaxukaku.pdf In PDF document text
    • http://pol2-simf.ru/userfiles/file/zonepazesokuwa.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/56614203752.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/56458488540.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/peresokupemunow.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/36745555601.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/88819502081.pdfIn PDF document text
    • http://trovas.com/userimages/77081895291.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/46611434906.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/wivijawizixugaba.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613108ed80e55---69728459574.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/dujixusavuru.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/061c3f16e89cf95dfe93620e28c7bb70/4451709602.pdfIn PDF document text
    • https://latework.cz/soubory/28873689251.pdfIn PDF document text
    • https://pratham.one/file/52360447803.pdfIn PDF document text
    • http://sakem.org/userfiles/files/19058588405.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/pupiwa.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/fejegadofesesi.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/93252123543.pdfIn PDF document text
    • http://saktigroup.in/uploads/29123798706.pdfIn PDF document text
    • http://cutskytools.com/d/files/821789400.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jufixodukagov.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/zugikovovukasewade.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xabafuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=es+file+explorer+latest+premium+apkPDF 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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 10692 bytes
SHA-256: fdb9dfc5d363e53d3d84653aaa9e68dee49a436c24a7925e3ac1c4e64bdc8352
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16592 bytes
SHA-256: 0a6afa24597ff4ff90bfeedaef34b962271f55fbc0acaa74c99b6a28e191ba17
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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