Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50a949b090d1a43…

MALICIOUS

PDF

94.8 KB Created: 2021-09-13 13:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 334f761f468461dc1b8fa56cf5535d0b SHA-1: 9dd22595bee15616b771697771c9fb55b3a4a0b6 SHA-256: e50a949b090d1a43d4b21e469525b333a8c533cf23b589ac95d1d06f057cac3a
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The presence of multiple embedded URLs, many pointing to potentially disposable domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://perfecthospital.net/ckfinder/userfiles/files/83617898540.pdf In PDF document text
    • https://arrayamed.com/userfiles/file/jaxavazejarub.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/66887948696.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ec94e557f1fb4d30c3fef24d3dd5b4cb/makiditowidetose.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nepuwadikog.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/dexaditawufaraxojem.pdfIn PDF document text
    • http://banquat.com/userfiles/files/87336803101.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/mifezojusimomilebama.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/zozugopuziveb.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109051646064375.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/98810962430.pdfIn PDF document text
    • http://espwireless.net/uploads/file/51103401734.pdfIn PDF document text
    • https://topupdana.com/contents/files/82172615588.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/83050081016.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/84998684878.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/1138829154.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111112161278.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/dinikixudenobamo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/84788391299.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/72412268402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=metamorphosis+kafka+full+book+pdfPDF 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_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10984 bytes
SHA-256: 7efe3ec5c72f85eb2f75d1ef9d6b9f222c8304a59845d35f65a486598f13dd0c
font_01_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 18920 bytes
SHA-256: 40add14fc40dcd12bb1ff181e9b90596a2d1b6cee139e1bc3577cd8fddf53831
font_02_sfnt_off000154e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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