Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7064914299ba5…

MALICIOUS

PDF

74.8 KB Created: 2021-10-04 20:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b60b47cc02264a0db9f7dea17f9edeeb SHA-1: acb31ac44f608a9856c5932eb9807b22439944c2 SHA-256: c2b7064914299ba5a0009e6e382e1eee04bf99db2aa42d5493b380ae04dfceb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, with a heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest a phishing or spam distribution attempt, likely leveraging embedded JavaScript for redirection or obfuscation. The primary goal appears to be directing users to a network of potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://byty-pardubice.eu/UserFiles/File/87379031547.pdf In PDF document text
    • https://metnar.pl/web/uploads/files/durujokarewaz.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/71120252837.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/93419133515.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/dotoxijanugukolujub.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/vogisinopalatekofakeretu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/sodiwata.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/41004880768.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/kisurukabak.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53981ee28---sisifitaxulejo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902142230.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/37418379095.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pavopolimon.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/bekewawewolemaledok.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/kisas.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/40344545451.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gupowif.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zewenoperejubepogujoji.pdfIn PDF document text
    • https://baongochoa.com/upload/file/28252758106.pdfIn PDF document text
    • https://fuoriscena.eu/file/bewitowabilig.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/53082087734.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/58e44e2e86a06ce1ec2b0c9e10b188a3/65663832607.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/tufevovur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+transfer+function+of+a+linear+system+is+thePDF 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_off0000c008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC008 17212 bytes
SHA-256: d1b9a14bdfcd8c8c794f6ce5f0bd144f2bfb4b3ac4f4361af06214efac377e5e
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10780 bytes
SHA-256: 324b3e539eb9bcabbb3b846bf05dd94f6a57bc2c481f438ecb7b5dc57e667f90

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