Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c63c9c8b024beb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 21:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 23691578e800d4d36b3229565120335a SHA-1: 71b4121cd24c263e35944547e9b99dd3749282e8 SHA-256: 68c63c9c8b024beb5a79f252a7ab07c221d3cf0116f413098345952cbad1ea0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://archism.ru/uplcv?utm_term=android+login+asynctask+example PDF link annotation
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/79391923796.pdfIn PDF document text
    • http://wamer.org/userfiles/file/bidozogov.pdfIn PDF document text
    • https://wildnaturetravel.com/File/waxatovogutumip.pdfIn PDF document text
    • http://sushibelovo.ru/files/97401721927.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/bekemiruxipim.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/vimuta.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/rokinig.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/karawoseja.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/bunokiterasunepoj.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/rivolug.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/57784898183.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909002104.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fibevukekumakajuzanamor.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/68006795406.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/bugoloxijugave.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901074407228708.pdfIn PDF document text
    • http://ccadl.com/files/20210909221333.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/jadivujug.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139684681f48---45945886202.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342486b6919---tajomapon.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/nupopu.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210918165937.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/2337243657.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/33739728961.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/muvezalog.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/loxetijiwu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/letipesiwevudu.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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 16104 bytes
SHA-256: 50a7091ee2434da2a80441509971a610f9a3803c46eb18107bc835b4d2e5ccac
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 11148 bytes
SHA-256: 2d1defbf6de83af8098be03f82a1b3fafff98ab25219cd3a1c960ee5b8324a24