Malicious PDF — malware analysis report

Static analysis result for SHA-256 64eb01ee98557acf…

MALICIOUS

PDF

100.4 KB Created: 2021-09-13 13:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f853b2beba913e39734d89bd5d914b SHA-1: 6d2da696577aa82a977f67e3f93752cdb364c98a SHA-256: 64eb01ee98557acf168c76f805f617ef4c3286c447e23df5a727f73da7b400d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URLs, many of which point to potentially malicious PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to obscure the true malicious intent by distributing links across many domains. ClamAV detection and ML classification strongly suggest malicious content, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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 http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/89994056558.pdf
    • http://csim.jp/ckeditor/uploads/files/juguzudofidovivup.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138473f65f97---24625941006.pdf
    • https://palcev.ru/userfiles/file/rebogiredudazopanotakane.pdf
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/79803312261.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/mokiwunox.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/vidadomuxelumijob.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/sekarekuso.pdf
    • https://interference.ajoda.eu/userfiles/files/bememivivikobugobigopab.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210902_545EE1C6A1A12394.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/30983730188.pdf
    • https://podimercrm.com/img/files/tamememif.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/53371278504.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/tozobibo.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/wetosozetopidusugexozeted.pdf
    • http://www.scsk12.org/policy/files/files/20400438871.pdf
    • http://gd-weimi.com/upfolder/e/files/20210903065859.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/81851f0d5cc93edba40398fff73231c6/dovuzifogilopafen.pdf
    • https://cpsguffanti.it/uploads/file/dexutajixoliwuk.pdf
    • http://sushistoryus.com/uploads/files/1061582599.pdf
    • http://thetestmag.com/userfiles/files/zotozasevi.pdf
    • http://delta-serwis.pl/pliki/jovikenumagago.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/41426236420.pdf
    • http://urotunisia.com/uploads/FCK_files/file/45938119295.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+free+hidden+call+recording+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001240a.bin
208c696818a4817e362206fccfd4ca92bde13d8d2dddb2c25ad19efea722e7f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 17920 bytes
font_01_sfnt_off000152bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152BF 16792 bytes
font_02_sfnt_off00016ad6.bin
6f0c779f5b472f6f4b73db709d4ca024dad116a43ef2270cc0359395a052ee17
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD6 10952 bytes