Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e528dc73890cd2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 06:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a065202ffb0aca12564bfa1bab411ae SHA-1: bfed8024dd850e5aff08ea5fa0ba16205b96f40c SHA-256: 77e528dc73890cd2321ca1b1e438d7710cf033ac4d3bc1899b223bbb30b32f8e
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 identified as a phishing trojan. It functions as a link farm, hosting numerous links to other PDF files on disposable domains, likely to obscure the true malicious intent and evade detection. The presence of external URIs and the structure of the PDF suggest it is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=supersu+root+download PDF link annotation
    • http://timavoshipsupply.it/userfiles/file/pipusavu.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/24878524066.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/46441718147.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109032156524454.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kajajawimet.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/2408215771.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sudoragezitikelebiluxum.pdfIn PDF document text
    • http://tcihk.com/userfiles/vupim.pdfIn PDF document text
    • http://skolky.info/foto/images/file/zuditaxalusuwojufanis.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/zazowexide.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/faxorup.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/pobupozakelidopi.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210911163134655344.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/dofojuzijolez.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/rizefabazupifun.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kudezarozukasozu.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pezuru.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/lorufogofi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136daef08427---97358687487.pdfIn PDF document text
    • http://lovesenergy.com/file/28817842477.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143d993ab91a---jesifewiju.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/1208607413.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/30932450356.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 18020 bytes
SHA-256: 01b549e25914e8d03ed718c8b3c5aac8cec40116388a2b881a123aa87b2356e7
font_01_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 10552 bytes
SHA-256: bce5a0803182129cad73b88cf3a3c4ecf3cea1a1e175d961592aff6ece83148c
font_02_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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