Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e11bc0b4a6bb9b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 23:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0784fc9658f52f1203d4816291ead72e SHA-1: 59594341146c853f31dbef970490ceb41c110131 SHA-256: e8e11bc0b4a6bb9bb184cdcfd241fa1af893bc9ea26f6f3072fe8e9b1d9ef538
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://immobiliareborghi.com/userfiles/files/86381392706.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/58817414000.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905095251.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/23239904674.pdfIn PDF document text
    • http://specialcats.nl/media/files/susemur.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161372bad4a61e---potujagimupupepe.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/povamozoximidimiserivir.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/furelapadebunatikog.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/logujuvixawigesujuwiwetiv.pdfIn PDF document text
    • http://synphabase.ch/upload/file/53346103741.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/rogenuwutewoxu.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/38993721857.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d08b604b---purizagixipuduwobavuwada.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/zafolifosepameruv.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/22643198335.pdfIn PDF document text
    • http://robbes.nl/media/files/72402101566.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/jerarisejudogenilejepuru.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/muriji.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/87441950268.pdfIn PDF document text
    • http://geose.ru/userfiles/file/88657700638.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/49131530960.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kagumerewekelem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+live+tv+app+for+android+pakistanPDF 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_off0000bda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 10700 bytes
SHA-256: 77c03d8faefbc35d21752252bb93701b6622cd900ae99661c32891b51f4526cd
font_02_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16308 bytes
SHA-256: ea811b502faac0b48538764a63aa6584fd6c1999b1f2a2395ba834c6753b4e84

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