Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f406f70b007f1b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 11:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 480b9e66d9f46f7009ef12a4320672ba SHA-1: d67a823cd6ccc398c574a290309009d81cb1abe1 SHA-256: 19f406f70b007f1bbbede72cb76f77a5faaf83c59e41b1498520a24fc36ab080
134 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports the phishing lure. The file likely serves as a dropper or initial access vector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=smash+vertical+theater+app
    • http://tatugigo.com/ckfinder/userfiles/files/nabumonozol.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/kikawajunexuwojev.pdf
    • http://alumcity.ru/userfiles/file/bimexet.pdf
    • http://acm-medicali.it/userfiles/files/23379313500.pdf
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/7610132432.pdf
    • http://viorina-deko.com/images/file/26808928358.pdf
    • https://likeevent.it/writable/public/userfiles/file/xabirigikodo.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n5cnj57vfm5c16nqmoq3fthu75/birasova.pdf
    • http://kgmda.com/upload/files/54210159416.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/62896011473.pdf
    • http://ellenia3.eu/userfiles/files/silaperojamatados.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/22150798650.pdf
    • http://madiagranitosilano.it/userfiles/files/gumipafokepisupen.pdf
    • http://renknh.com/ckupload/files/getusefixexavoluzimexulip.pdf
    • http://utcsp.rustyramone.com/uploads/files/91805922476.pdf
    • http://zzfcw.com/file/fkimg/file/mowesoxedavepeduvunide.pdf
    • http://ballarioarchitetti.eu/userfiles/files/ruwonujudolenij.pdf
    • https://gencerenerji.com/resimler/files/68325435474.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43388209974.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/14519212917.pdf
    • http://stringquartet.biz/web/images/fck/file/86576203915.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/51975737411.pdf
    • https://chaletsuenodesol.de/files/jatetolujusujubabigip.pdf
    • https://rakowka.pl/userfiles/file/18223199189.pdf
    • http://yuanyoujie.vip/userfiles/file/rixoku.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/sebix.pdf
    • 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_off0000e633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 16792 bytes
font_01_sfnt_off0000fe4a.bin
5fb4f12cc3b83c18fa56fe9b847a248985202077e1c640e2998558471058080c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 10556 bytes
font_02_sfnt_off00011658.bin
998066556a66a39da82fbccbd96933163e72708dba88418969b0efd4a3c341be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 21732 bytes

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