Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b47d516790de1d2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 10:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cae9a5928e24ab04de42e8e4f5c90e7 SHA-1: 622d2c1f52849f67984a4400421378a4016abf2b SHA-256: 4b47d516790de1d2d0046db31d413e7b839869309736a16e84c4fb07b62f71da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it's a link farm with many external URIs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript may be used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cpc-serbia.org/js/files/bezebovi.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4ceba6be---12381082302.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/49875311643.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/51991498300.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/69738399734.pdfIn PDF document text
    • http://marine-inox.com/i/File/26149876192.pdfIn PDF document text
    • https://subded.org/userfiles/file/mareginovejufogi.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/23420807568.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/93384554726.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kirot.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/zalepewenovebonuvigepiwe.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/wuvujaxivebuvowude.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/63260218398.pdfIn PDF document text
    • http://www.ezmoving.com/file/jawuvasatubupaw.pdfIn PDF document text
    • http://gabortech.com/admin/file/lomosogodokewoviguzelezu.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jitobilak.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2974ae7931a9d5dab0a5e5807dfb3f0a/54620141728.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/jagejidimixewojedupodeses.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/87116776453.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/gepozekolitogorimuso.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/44299318957.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jobutakikuweliwasib.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/53312251697.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/47453055652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=browser+widget+androidPDF 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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 17292 bytes
SHA-256: 97621584a0363b4cf20d39f64c206fd72884592375e5a806d016ca4ce9a062be
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10516 bytes
SHA-256: 928b8e4f6e542308618b9f8d6f9edfb3b4bdd7350c7977ace787b076116f6ec9
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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