Malicious PDF — malware analysis report

Static analysis result for SHA-256 756bfd36b30d4b45…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 05:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2afcef24636abc791aa34804419b210 SHA-1: 44ffa7f8a4c7e761bd5fbc3c0c5d47bac98de42f SHA-256: 756bfd36b30d4b4522d3f903a38fe8458add7667fdacb3d6538475aa2b898be4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sdv.sk/userfiles/articles/file/danerijoxinaxasufa.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbc57be78---guxunimejazaliliwibimawov.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/33517878565.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/47764858117.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pivefanalareguzuwev.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/xigekoxuxetowatufiwaje.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/70167377415.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/nidanubifusit.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/90954496720.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/60151573294.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/36337610972.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905230231.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/bijiwiduvunixenube.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210907213330.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/dezidijofudorutelavabe.pdfIn PDF document text
    • http://penetrat.ru/files/files/lanifipijuwudewoneso.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/39177642047.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/zukufaniveropaguponi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/9866687680.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/45270775358.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/97734171195.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tusejoduni.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/gusumoxokopedile.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/83505098416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wear+os+more+watch+facesPDF 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_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 10440 bytes
SHA-256: 75e7b4099703e6c06744dea2eb9e7c03925195a32db8df7a5bda078e77fb4b15
font_01_sfnt_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 17892 bytes
SHA-256: bddf012f0bf9d7ee27ad92a7b4262b4a9b9178e42490c752fba8b08156cd0bb1
font_02_sfnt_off00014a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1