Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe1ceda5c26f712…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 08:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96f51335b8cd956fbff8ddbb403da23a SHA-1: 0a26695931bc879423a0ce245019a014daab3935 SHA-256: 8fe1ceda5c26f71205b0ba1ed264e00f4d6d22f8efdabdb6a87d9a9a4b28890f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rwd1.thadv.com/upload/files/98665962392.pdf In PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/15470201947.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/25741451190.pdfIn PDF document text
    • http://gespk.com/userfiles/file/35772244387.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lumujesidojuguvebuvejet.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/rozapesixib.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210912085831.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/paruxoje.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/gokope.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7757dd2f3---dexolivolutu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mokeremuvus.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/futirarimi.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/zinivonadisidalo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nomutagatigipamifoxa.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/nixamabojozeze.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/16925404918.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/tomimemiv.pdfIn PDF document text
    • http://reylab.com/userfiles/file/50669956293.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/welujaka.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/xenokipojivozetiroxomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=henry+stickmin+collection+free+download+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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 20212 bytes
SHA-256: 89695abb20496848e1146f54c0fe0ba6b7ffcb5ab1cfa9b0908e536986b034a1
font_01_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10920 bytes
SHA-256: 2a7e25fa8e4d3ae20a5c5af6416e4c0c631ad59a6036e5c5ff3efabae9e42af7
font_02_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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