Malicious PDF — malware analysis report

Static analysis result for SHA-256 02508fa8fe5a937b…

MALICIOUS

PDF

91.3 KB Created: 2021-09-14 12:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abb7a529d77b47839df18074ca56f85a SHA-1: ae9d3206b2732d333176a8df165108baae7261bc SHA-256: 02508fa8fe5a937bd4846c1ff50d744feaf07687a8afd3e9978a0357b77de47c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation that the document is a lure to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=real+drift+unlimited+money PDF link annotation
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/72262008837.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/govebi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/xapovokotimedijutam.pdfIn PDF document text
    • http://gestioniarmatoriali.it/97164843240.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/67537011006.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/xasawakefuzofenob.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/kumorelixetaz.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb5c17e5e---lonofaratanosukibulusef.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/pumulevogagulunup.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/oddet1847577s2a9tjbepbu3a6/xiwapumotezatebudoz.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/79624271546.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/10994861046.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vekoxarewumosila.pdfIn PDF document text
    • http://talleresjpg.es/img/file/90113594148.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/latok.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/jekuwemubipur.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/tijovumuposixe.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210913214246696670g1pzub.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/58381610549.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/23034767308.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/10471056411.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mawenevosatukokolaken.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/ranosip.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/69503494672.pdfIn PDF document text
    • http://clickvay.com/upload/files/37720316701.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_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 10608 bytes
SHA-256: d1991adb3b1ec04d26770c88410d1101d867bdf64099d07d48f8b217b105bee1
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 18484 bytes
SHA-256: 61c9dc6ae7b24eb3166933edc68c9686799539c02bfbbbd8b0ba69497bf7beab