Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7bc589aff9e939…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 14:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 91731dd00446ca2a37e05290ccf55103 SHA-1: 25b5125cd98ec23b9190a4689f4d33efb6081c8a SHA-256: 2a7bc589aff9e939d4fc8bc8669fde1242c96d972a40f7435b3ac0365be6f99b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://garglob.ru/uplcv?utm_term=prime+sleep+recorder+android PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614d155d83693---72707072191.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/fofisukojuzo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/18774146608.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/23722668814.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pupusigutiloresaniwozulow.pdfIn PDF document text
    • http://status.cz/UserFiles/File/15231346688.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/gowul.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/52591742046.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/suguzesijokuvax.pdfIn PDF document text
    • https://tessuno.com/upload/files/6151e9f077bd6.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161507cf4e1a7c---zapajovenum.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/sinikifevisujugat.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/77349907222.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/5036417808.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/romagixusotonemi.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/45023822996.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/nilij.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/93971941217.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/savolazoku.pdfIn PDF document text
    • http://travellerisland.com/files/27082460879.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/16050465135.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/moxukelok.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_off0000aca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 16192 bytes
SHA-256: b1d86a89e663b99dd5c3abe329671794efc7b0c60fc23b2e9ad3aafe70741636
font_02_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10576 bytes
SHA-256: e9e0ad5664dea9af422781e3d611dae1efaabfad477cc0e64cc4c303985ebd24

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