Malicious PDF — malware analysis report

Static analysis result for SHA-256 523826b7cc634f8e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 20:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 387788f7f0598aed18194f06efe2f073 SHA-1: a534ca10f85ff828e7621f1161768ffbde8340de SHA-256: 523826b7cc634f8e59626ad1729d04c097e32cd7ed4e53725fabe7acc112dcf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to potentially disposable domains, suggesting an attempt to distribute malicious content or phish users. Although no scripts were directly extracted, the PDF structure and the presence of external URIs imply an intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://megat.pl/uploaded/fck_files/file/raruwepilugalik.pdf In PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kalagenugosivukagupuki.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161302cb68322a---kuxitukoriwepokaxesipij.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/movovozijapere.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/15669691538.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/fifugefirarirozukup.pdfIn PDF document text
    • http://artospace.com/pics/file/32930385989.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/wowinojijalinokowileg.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/44683221484.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/57508129561.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/xokak.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109031102525564.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909061859.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/32879449273.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5b4f572d0324db7bc009c4d91082b8cd/sukirunadikudofosonix.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/gujuv.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rovaxibokurawuvilowewup.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/fikerujaxusaduxepesapojo.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/libodaloravarikufobavo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/2292910909.pdfIn PDF document text
    • https://majubesar.org/contents/files/mazaguxumipatixilaxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+no+nfc+meanPDF 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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 10496 bytes
SHA-256: b2e41cd718ba7669ada34584de89800c74ab760a8199f5b0e9ec409190efe6b9
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 17284 bytes
SHA-256: 29a7e03e8dbac897060142e389739b1b6fa09bd0c5bb62a2f2f31526be5ede4d
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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