Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b8d814f7afccc3…

MALICIOUS

PDF

89.9 KB Created: 2021-09-22 18:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6194cebd1516bbf0ced703f44d548a5 SHA-1: 5f28a76f9c343043c55c6a09a3e34c6a92d0a9a4 SHA-256: 85b8d814f7afccc3ec0a619350dd0c3cbc3480c23142da4b18d831829f090ce3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/290666fce7effadff80782d414703bfc/zovoworinimap.pdf In PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/74488928144.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/35904345279.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46038682984.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/52746134137.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/29406905241.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/lanejakadalo.pdfIn PDF document text
    • http://kesifveotesi.com/files/13583869103.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/rivobasikedil.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/javekegazitomegukodikewi.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/wavazuburus.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xogojajemonizoponosepidef.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/visesasodufibunuxomuxi.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xibevosivajamevumaxupegow.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/rujumoxipufifuzaxeboxewax.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/texuwenag.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/12621121931.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/wotorevo.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/86089746159.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/24088092406.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/57127242499.pdfIn PDF document text
    • http://health-bridge.in/upload/file/72732839695.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109120104038715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vidmate+app+freePDF 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_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 10192 bytes
SHA-256: 05453685a92953572c63222887ca60fd8e5ea0231b2109c4c8c311552e50d0ab
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 17680 bytes
SHA-256: 8eb0dd1a40acef060eb05004ba22592cbd316213359375ee6807d355c8d98fb8

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