Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5982fb9e036130c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 08:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1dc67614a11f6b0b782b694fc832680 SHA-1: 91fb815c547214b77318768a8be78cb5d0f57760 SHA-256: f5982fb9e036130c025dbef35a2f329b8a85b7f51586b7ba8f54ade34133cc70
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous external URIs, many of which point to disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6647

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 http://sbkf.org/files/files/peparaliza.pdf In PDF document text
    • https://saksisan.com/upload/ckfinder/files/93159999163.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/dezasiwusi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/nimubapasibumobipebosuje.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/tevezuxaxomuk.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zugulalibowuli.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/zomumawimetivujes.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/xedubozapiruxaj.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/zugaw.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vegolopi.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/weselopef.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/tirukupugiduroko.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/86356962305.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/xufesasirosovuxew.pdfIn PDF document text
    • https://laser123.com/geektic/files/xusirafokapolofata.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/losibufemibivize.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zaludozanogunewelukibe.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/10075347741.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/73966757397.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/92135180456.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613121d0d671a---jejewolunonetodudada.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pamoborimu.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/98789589870.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da001727ae---memebumexuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dead+space+1+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 21040 bytes
SHA-256: 59dc88b68872f2dede18647aeeea55215c6eec0b38840afa6b104b493c114d34
font_01_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 10092 bytes
SHA-256: 2c2d45f8305147848fd85d3cfc536e397b2ad54b169712faa9687a4415acd953

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