Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f00401bff0770b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 06:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83e501471694e35ad23c0f0e806f3886 SHA-1: 6545324201f411c6da8e4abec38fe3d8be93eab1 SHA-256: 77f00401bff0770bfbbb535aa0ab0218d225c9f9f76cb2d0fa1e0fea6db88465
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. The presence of embedded JS points to T1059.007, and the overall nature of such files suggests T1566.001 as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7222

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.
  • 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://synerhu.ru/uplcv?utm_term=hero+academia+movie+1 PDF link annotation
    • https://n-zvuk.ru/upload/file/95199140081.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/raxurujidusilu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/27022117929.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/58047605942.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/14169440965.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zixiw.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/65731067748.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_091002_6111.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/29238629334.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/pisevawedowa.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109071508272954.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/49433644774.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/76379307819.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a346713120c1e2eeb6fb33edfbc18da/zolubopas.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/62722048806.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/63437155024.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/30254413069.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixejikeropelor.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/50638285552.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/37308111798.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/16298748819.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10224 bytes
SHA-256: e0e5151b5ee8775319676711744a36b47a8d5a1615b3255f93508c487862f236

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