Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3599e178f8c272b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 23:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4501772c0f6d670f19f9d79ec75553b2 SHA-1: 3354e57ce5cdd9f64682468c07ebda218cb8e71d SHA-256: a3599e178f8c272b09d6cdaa4aa47b1cd99372d28391ad1a3d9fb0ca6bdeca00
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8926

Heuristics 4

  • 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
  • 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://laborke.ru/uplcv?utm_term=mr+bean+swimming+pool+scene PDF link annotation
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/67383393854.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/ketune.pdfIn PDF document text
    • http://domosplast.hu/files/file/7566447136.pdfIn PDF document text
    • https://kawanmto.info/contents/files/maguduvabajutixewolidap.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/62453652852.pdfIn PDF document text
    • https://ayurmitra.com/files/file/68264993658.pdfIn PDF document text
    • http://envigest.cz/upload/file/dotatijunivereluzi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310de994798---wofolowat.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/75737705236.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/83694763117.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/ranukomuki.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/70535180276.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/12954473420.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/60921640014.pdfIn PDF document text
    • http://skia22.ru/pic/file/vakiwubadag.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/46020338576.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/316662130.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jekawopelofujof.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/68594699744.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/13728089585.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/tetume.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/jisodelupomaro.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210910_195152.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92349334291.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/5743918896.pdfIn PDF document text
    • 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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 18168 bytes
SHA-256: b4a807626f3de9b601ce40050b89643315011ff575537fb17bd9addd6c1211b9
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10836 bytes
SHA-256: 06d54d5a95eb407a7c4b201e1f7febfa75a0b23962a9523d129216e499c23f04