Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f3c39c8b8dd8b7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 09:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3e5d591a870ea122582f6ca02810bac SHA-1: b1dd0e1a575418bcab907cb2d82ad39a2e9d3279 SHA-256: 44f3c39c8b8dd8b7ed186ac942aed1abd0d76e4473fc4a774c31c7affd3ffe2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of a malformed exploit stream and ML classifier flagging indicates malicious intent, likely to trick users into downloading further malware or engaging in phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=express+vpn+mod+apk+unlimited PDF link annotation
    • https://univerosg.com/ckfinder/userfiles/files/75959427270.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vokereruw.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/nonakoguzeboxago.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/duwovenuratajo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/sarisaki.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/sologotinijinu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f7f8335056faf97094c73bf056331f6c/wikapepeb.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/bivutulivadoku.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/pirem.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/29040956973.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/nasexelo.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/91352404476.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/12208227119.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/dodufeziworofo.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/faratekonixad.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/botajebagototi.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/4705166244.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/musidoxemunetenevagilibox.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99597857457.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/7843430904.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/gafev.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/setafubix.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/tugizabovutokozebi.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/62040326839.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/45855219377.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/46985953410.pdfIn PDF document text
    • 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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 17768 bytes
SHA-256: 5c32026020db535211428cdfe4ce8317ae0c36c92042915ec00794124bbaefce
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 10896 bytes
SHA-256: 61fb9d9ef9e22503e6a3b928312335d6d327b424f175596392ddba9bb509baca

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