Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0ae9473a6797b6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 21:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd0095433d11ec8fb637c5a6a17c8c59 SHA-1: 0f62b1eabb613826db2590448b327aa683742ed3 SHA-256: ea0ae9473a6797b64fb3488e0ae2f714d71fce546274a5d7bd6c3a027d301c04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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 https://www.grdr.org/paidel/ckfinder/userfiles/files/gibufalo.pdf In PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/2833807940.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161399660a5513---17851208649.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109011022418624.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/nemakibedezi.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/43387048621.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/58734852316.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/32598914309.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/muwatefak.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/nuvenevukuvigigeteroxus.pdfIn PDF document text
    • https://rinducm1.com/contents/files/pizunagatevak.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2f540950ee6d2f705fb8aad2db391142/29954265443.pdfIn PDF document text
    • https://trexanh.net/upload/files/jumonawopiv.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/vafuwux.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/bifame.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/dagukirebavanoj.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/2380097628.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/sanonofogeradotebad.pdfIn PDF document text
    • http://kd-council.com/upfile/files/xibuveguti.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/58059069604.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/60663217557.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xasuxifejasitopikafegez.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/55135946639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=avengers+endgame+full+movie+online+streamPDF 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_off0000af1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1F 15644 bytes
SHA-256: 1865cb0a5c3bf6ed83dfce0d4451e4d16b154a57f5c795ec7b3045db8456e36d
font_01_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10844 bytes
SHA-256: 2c202f0b986e76d485b577621df66f5add33c6c0761e29fd07ac0dbec175a9c0