Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe948b9835f8648f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 02:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a79794d79552476973d3e39f114cb1e9 SHA-1: 9f4561d455b3ae55875574e14198f30cf4c073c7 SHA-256: fe948b9835f8648f7f0dfb5bca90540db63fa0ee3625cd25338ee269308f108f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to distribute malicious content or engage in SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gidaero.com/upload/fckeditor/file/80688350460.pdf In PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/zodot.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/ralotiwefadew.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/24484209929.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/nafesupaka.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/56477514599.pdfIn PDF document text
    • https://nexusmediation.nl/files/pulawew.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/lujesanilu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/g6nhg989bnkc2t5so57kkcsbdh/gukoz.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192155721240.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/lazod.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9ec2c64fc---93563844646.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78110205881.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/kusinawez.pdfIn PDF document text
    • http://theshop24.com/userfiles/file/bifopije.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/61747741998.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/68723729893.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/pubopunasugigi.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pupodezalolexonapofotelit.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210914203258.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/gedigub.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/kujexunigevobed.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/60407926437.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/9106456585.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wifitosap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sulphur+is+metal+or+nonmetalPDF 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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 10692 bytes
SHA-256: e70eabbde1e80630ac43469ac20181fea816f06980ec20673f7582e48d4e50a4
font_01_sfnt_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 16932 bytes
SHA-256: ea63edfa499e01792aa55dc921b93b130d9219808141cb5e9725cf64ba4eeb5a
font_02_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.