Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98dbef7cb43598d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 14:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bc02ef0b6038da9356d5fd27a147494 SHA-1: 138dfc8ff29951843b02dfa97f65304713be181b SHA-256: d98dbef7cb43598d53193667c852ea67385ba62c513ea4d29bbb08771f61f817
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. This suggests a multi-stage distribution or phishing campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kimibifopudusabosim.pdf In PDF document text
    • http://vibrator4you.cz/UserFiles/File/48557602152.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/duxevenowozovimovoxegeno.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/gadinapoboxog.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/21116562549.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/japofulubakelododasi.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/nadizodukisasisaresitanu.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/75234587561.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/28575280715.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/95183930151.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/60048022611.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/wivoxedisenekiberuvesul.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/15177364136.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/9412733319.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/jamat.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/57124945417.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/refelexolalidigutizodanu.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/20581838569.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pufabumupaxujegoterewe.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/xuvopasumexibiladix.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118a306288---79985427746.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/nigidisenexobofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ukbay+proxy+listPDF 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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 17632 bytes
SHA-256: 7f4fa9f6623bc0743f148a8cc5ad741d7e49567ddfebeb4ae3d0142eed586f1f
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10464 bytes
SHA-256: a03972a6fdd41238a3fa60491805ee38c9673923d8792e26ff7d524c4442fc87
font_02_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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