Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6fe5970aed2a4b…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 09:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4b33e8426a668ae4aa0f0c8edcbe0ad SHA-1: 8c1c4ccf71b1243cf88c0711b243e6f753941a23 SHA-256: bc6fe5970aed2a4b069ad5f4b209335d824490c5a40fc34fa052f361f3fffa7e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external, potentially malicious sites. No scripts were extracted, but the overall pattern is consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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://philabc.ru/uplcv?utm_term=iptv+smarters+app+firestick PDF link annotation
    • https://medicentrumnz.eu/medicentrum/files/file/74605957317.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/medalewoze.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/99990752746.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/3811782057.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jabizuxekesazes.pdfIn PDF document text
    • http://weshare.vn/attachment/files/89674014393.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/losujurumuwiw.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/58862368169.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/40218813512.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/barukekajixegogego.pdfIn PDF document text
    • https://shevian.com/images/file/7666812973.pdfIn PDF document text
    • http://pedraferro.com/files/files/1413838058.pdfIn PDF document text
    • https://sino-islam.com/upload/file/221107158285.pdfIn PDF document text
    • http://benrassam.com/uploads/files/10445432442.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/movasuzuduvukerulo.pdfIn PDF document text
    • http://bienbao.net/uploads/files/lolemigolebudaxejab.pdfIn PDF document text
    • http://briztravel.com/upload/files/zazelapexubilililujikadox.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/vabusuzagitikizozob.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4e806850---11009554238.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/59239208805.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tunumojarizubu.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/83829259826.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sebunoxezuruzi.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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DA 10480 bytes
SHA-256: 007bfd321685d3a177207fc4a38883e4ac012a4fa152ee75741db84b6a08fe7c
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 14944 bytes
SHA-256: caa58350685f9238e785d8a7a46444099432c15c32069294c4325f0811824b62

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