Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7169b932f72cec…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 17:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 905fddcad8fd7002941027da516e8c25 SHA-1: d27b3207834cb3700796fa5b950f41cf74e8b2ae SHA-256: 4c7169b932f72cec56bb06b78762f4b7d99c60de3fe25e1b3663441502ee1e7a
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 structured to appear as legitimate file downloads but likely lead to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this PDF's purpose is to host a large number of links, potentially for SEO manipulation or to distribute malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=negative+consequences+of+urbanisation PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137711af2f23---baxawawegizaluxozewoluta.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/43758663802.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/17226601350.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/98263541895.pdfIn PDF document text
    • https://10fci.org/userfiles/file/vibaxaniwid.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/15903479041.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/65131879084.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/28455464200.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/10355992410.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/49131799225.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/99485959922.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/70725793105.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mozipukumuwafutifug.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wadexukorokenoz.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/25953304527.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/tijejolilizu.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/zesisipudami.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m1r4407fmft5na0tif3ev9rs96/zijazudusaduwevejeni.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zabadafubiditudar.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/kazavawagerawonapuko.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/mewixonumeg.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/mofiwofefexewatazavi.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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 17840 bytes
SHA-256: e50ccc0bb8876356d0ba54f2b117593fc630c39a9ec2664bc5f2c99af87a9baf
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 10896 bytes
SHA-256: 10f777ded49b7af75dcb6725fc36783965654b1056589b84edee55216b40af5e

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