Malicious PDF — malware analysis report

Static analysis result for SHA-256 b553f80058a1ee6d…

MALICIOUS

PDF

111.6 KB Created: 2021-10-05 13:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7270396ef6d72a7aedb857c71902aa46 SHA-1: ad679ff592c986207c7e25c12ebe015f0ae886c9 SHA-256: b553f80058a1ee6dabf26a2fae477e0027a03c5f9094f78b845984215559f57f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of multiple external links points towards an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=female+comedians+2020 PDF link annotation
    • http://hai-bi.com/uploads/files/202109232353275960.pdfIn PDF document text
    • https://thepainter.asia/upload/files/4395391708.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/gijudezopimune.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/pewowodotofojegemevures.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/29d2dc5d0dbf9f00fa65d90761ef5386/29535061981.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/pujoletosebozowori.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/sononalowepibasa.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/lipexedakomuge.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/6936604986.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/tezufo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/taluda.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/67497876886.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lotereduwumemepeveloxibow.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/55346741668.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/maxadogotiwig.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/dolafujexinumowokebewivak.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614643377d485---folafedapokomapapi.pdfIn PDF document text
    • http://centronegozi.com/public/58859576237.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/jifonabenage.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/40024276792.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/nafopezedotufizinal.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_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 10552 bytes
SHA-256: 4b7cf6f7579ae4d6c78109f6128bd0136f79a3ff46a0e6fa33f3b7c5d64054a6
font_01_sfnt_off000160d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D0 21740 bytes
SHA-256: 65d72655fae12bc7de276bcc139dd2dda5d6a53a671c45e5ef97f64360d220ad
font_02_sfnt_off000198e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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