Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40e8881cddc4013…

MALICIOUS

PDF

77.8 KB Created: 2021-09-23 09:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6308d855fe5c29c3ef43cf4ee3d8bf62 SHA-1: d919daa4eb694c8cd980c82612b676bd3f72b99f SHA-256: e40e8881cddc4013223515879159a514ae53ab77601ab928e5f500a8582cc642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wiwofurawa.pdf In PDF document text
    • http://dreiseengrundschule.de/files/78511805797.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/12119662033.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/meduxinonipodirozozom.pdfIn PDF document text
    • http://velisend.ru/photos/file/pezajuxojivaxomof.pdfIn PDF document text
    • https://spacio.hk/attachment/file/39829441491.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuganevu.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/83235738757.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/75734964443.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/duwugaxomotuj.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/wutebopidafuwewaxavikus.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/32053918281.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ojan3ae1fh8n5uvjtaeiag9pf0/rebibigoguxi.pdfIn PDF document text
    • http://1careglobal.com/upload/files/55219240852.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sewupigelupogetewegasul.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/doroxawozapeponip.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/xivajakuvivebufijam.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091615161842.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/nuvabu.pdfIn PDF document text
    • http://fitviewer.de/files/file/83597042330.pdfIn PDF document text
    • http://mfahk.com/upload/files/gitotisiwanaro.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/43138798831.pdfIn PDF document text
    • http://alptw.com/images/files/vutovirelexarawutegu.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/17100132865.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/duropijanuwexapapazonep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=democracy+in+america+volume+2+pdfPDF 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_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 17728 bytes
SHA-256: 1c39052e50f65dcc1282d8fb8cc0bdb1271a64371f798af6544122738074b14b
font_01_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 10916 bytes
SHA-256: 3e99abb7ca576ea9f23c77c6529b3c83e55c335e247fd9c06103f47b023869fc

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