Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e18a6a4f6aae414…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 06:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e135fa57d3fbc69d7bd21167df91d3bd SHA-1: 27620f47e92027d561d435b29ac5fd33f09d2d1c SHA-256: 8e18a6a4f6aae414fbdad60123acdb8cd59490cf6408972e591880a8ff49b1ac
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) and the nature of the file as a potential attachment (T1566.001) support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7122

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.
  • 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
  • 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://coretry.ru/uplcv?utm_term=jetpack+compose+spinner PDF link annotation
    • http://marthomaiticherukole.com/userfiles/file/pugukikubuxadupifoz.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/fodokuxego.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/finimapop.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/pezuba.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/ritixiteribemakugawamer.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/karipaxijekoxaji.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zotujifelunetanipavazuza.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/92716461447.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/99936972568.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/35667763921.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849a4a8a85---19522564353.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/wazowototukinovije.pdfIn PDF document text
    • https://salwangurugram.com/files/42631413437.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ligexanadiwupa.pdfIn PDF document text
    • https://ratosatu.com/contents/files/90376982356.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/rigop.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292bf3535c---89718198174.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/76804148688.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rijideranuwovezij.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/ralapa.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/mawefivixof.pdfIn 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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10572 bytes
SHA-256: 6dbcd35f623c9dcdcaa0b5d92326f62531e5f3323c6eb2df4629998eee765d53
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 18964 bytes
SHA-256: 7689220cf669da783d0558595e5dda74b0b75cd117645005c57a29460fa76736

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