Malicious PDF — malware analysis report

Static analysis result for SHA-256 343cbf921e26f5a0…

MALICIOUS

PDF

88.7 KB Created: 2021-10-27 08:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f8109161220fc5078d6da7629ccb64da SHA-1: 01d34160edd48b078ed0508c5c25f4c61d6cb605 SHA-256: 343cbf921e26f5a01cb50c716eb56ebedb6aa92338df9596b80428a20c905a86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sitoad.com/bbqjoekey/files/202110051049168015.pdf In PDF document text
    • http://mirai-kankyo.com/userfiles/files/wotosar.pdfIn PDF document text
    • http://remobudostol.pl/pliki/tesobuxuxefevikitaroxuvo.pdfIn PDF document text
    • http://100tmt.com/uploadimage/files/20211027023426.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/katinewoxigijux.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/buzuvoxuwigozaged.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/76968802076.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/bewuliba.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/76506697893.pdfIn PDF document text
    • http://contextuae.com/resimler/files/1180979722.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/titubusamesogafoj.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/jasunosizinuludaxopu.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/wumotegili.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/88371721887.pdfIn PDF document text
    • https://bliznacite.com/files/dilalojenuvorinadufe.pdfIn PDF document text
    • http://stromzeleny.cz/file/12150213247.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161492f67762c1---dipufosopuvefikukojaveno.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/2350989078.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/35433141242.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/48496211289.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/girukuxozukufesalanu.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/mewuxarozanigirimuk.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jozun.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/xesarakazep.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jagoxazoliginifiduxovirin.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=vsam+interview+questions+for+experiencedPDF 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_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 11204 bytes
SHA-256: 690deb518ddfd8be928445642f7162ee6e27ec1c6766721937131b88768fe1f5
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 19292 bytes
SHA-256: 6d49ce78b065c0bddeb7bacba62fd44890a967d6dab406ba7f6f97f819206bbe
font_02_sfnt_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1