Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb522d77d5d3c9a4…

MALICIOUS

PDF

41.5 KB Created: 2021-09-29 08:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d0555c34f6518a06961118764beb7fe SHA-1: e5b734261911a1acf38c0f803d2a94ceebff8a96 SHA-256: fb522d77d5d3c9a4124d9dc36c17cc3ba3cf4b4decac803c87b1540094ac57bf
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, designed to trick users into clicking embedded links. Heuristics indicate it functions as a link farm on disposable hosting, with one URL specifically mentioning 'cacher application android'. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=cacher+application+android PDF link annotation
    • https://textolinguisticsolutions.com/upload/editor/file/9513744188.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/xumebuverukeb.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/xabutetokebivexokatujopo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/93924869055.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/50872444871.pdfIn PDF document text
    • http://hidropro.hu/upload/33415456850.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/nasetenuxi.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/pudefil.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/13072500096.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/59385395448.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/63247632234.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/pavavajuxozazenopaje.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c4fa8145---jitomobutumeditebojekal.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/letijuvezugisizilu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/14614311288.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/pitewugupakivawan.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/ruxogeroruxosojixetelud.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/878820599.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/72970100140.pdfIn PDF document text
    • https://banghenails.com/upload/file/11379729847.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/paxunazutanudixazi.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109281501354117.pdfIn PDF document text
    • http://afslab.asia/upload/files/gezagixi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/efe6d283fa683c6ae6dfcd39537e7e22/mozelowubikanuwipogadora.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/datojosatokebofiteru.pdfIn PDF document text

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