Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf812074cc28c48…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 07:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18c99b9470abe6db66c41c0d4541e9bc SHA-1: 1be4a8284e1b904dfd20c9882a28aa2c37ac9a36 SHA-256: caf812074cc28c485082e9ece1b6a898b2ea2305aeb4f12003f800fdd9527f57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hairfibers24.com/upload/file/vunosodizuxobi.pdf In PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/18539642414.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/86b3432879ad62873de34f7d916c7f4f/21601927010.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/moxemexemudag.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/23261099040.pdfIn PDF document text
    • http://ccshecea.org/upload/files/18483707676.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zevowajisumiw.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/nututufegejazena.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fedamodasunenafakar.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/49789404975.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/84701321398.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/48080034673.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/bavinomot.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/76706096423.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fikuxiraxu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614daf7e6cc32---80860185427.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/29889683853.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kilepupimaxasekade.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/netedutid.pdfIn PDF document text
    • https://beaszemin.com/files/munogolopib.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/13836747582.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/20063348440.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/fafiwomapuvofikewagiwav.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dagiridedaramikakibulid.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/24758421895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=printer+settings+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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 15116 bytes
SHA-256: 016cbeca88f8100a0526013b325f17a47988e98cdb744e2830959f8a1d5a04b9
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10376 bytes
SHA-256: 07932205f762812565a5bb99d425bc6164bc00654ee6f0f66dd81ab69b9cd111