Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebdd413cc7a15dc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 07:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a48484e865709c15a016960eef913f0 SHA-1: 116e9ea007afc16374d695957fa2bdd2e8b7849d SHA-256: 2ebdd413cc7a15dcf4f2be410f4a34b13b1c1654988dbe73f093a96730481f19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination through multiple redirects and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=arijit+singh+audio+songs+free+download+mp4 PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd56a390e---79512230000.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210921_35A4FADAEC0F8A38.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ou452ijj55m9eddkcv4enrqkc9/40817958383.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xagijaluwisowokimukenezej.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/80034100443.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/88699247130.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/pofod.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/lupojofokuko.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/12199114135.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/28479786087.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/98048119564.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/63036812649.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sebufobibebibofubekasi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/93412097897.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64244209587.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/ruxixabipisilafil.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/xibudaguxikajobefu.pdfIn PDF document text
    • https://ms02bet.net/contents/files/94853448504.pdfIn PDF document text
    • 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_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 17684 bytes
SHA-256: 50958d0cc79bdbca2c04776f044f2393d4469dc0a3934fe33681d21fe40b9d13
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 11320 bytes
SHA-256: 66fa20f7f3011352964da20d2473a5db118979107d2b2836dde337f135980957

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