Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aec86a65a218da8…

MALICIOUS

PDF

59.4 KB Created: 2021-10-14 05:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7a9eddeefb1f1d22551846a157ed9e2 SHA-1: bb862d3dc2a80fdba24476eed11a726474b92887 SHA-256: 1aec86a65a218da82885e09543cf6403b451b227d4104637aa2ce1337c4a43b4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The PDF structure and embedded URIs suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of many disposable domains and UTM parameters indicates a campaign to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5512

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cructi.ru/uplcv?utm_term=roselawn+cemetery+hours PDF link annotation
    • http://ausafe.net/images/art/files/36650673839.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1615086038691e---75123402280.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/jomujobonezowibotijarog.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/50164656635.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/fiduro.pdfIn PDF document text
    • http://pololanna.com/user_img/files/guvugigibulezusixik.pdfIn PDF document text
    • http://dominant.name/userfiles/file/22691879414.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/jowixagejudanitawuwip.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/buwugaz.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/modaxipuxevibosuvow.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/933431094.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210908_61B4A2A5F1A67401.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/52103376344.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/metelegafudikubuvoved.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/nr8ss28fbom7ppdtkc1vr6o72t/98602135044.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/73836960773.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/nisaxelixodetovawita.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210908175538_g9ld0r.pdfIn PDF document text
    • https://aildf.in/userfiles/file/4872789929.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20211012201404540.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/nilomez.pdfIn PDF document text
    • http://splogservice.ru/content/files/jojaf.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/gumamiwewalizarukesab.pdfIn PDF document text
    • https://pecsikult.hu/files/file/jovulepal.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/76457954691.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/23904728287.pdfIn PDF document text
    • http://standardamulet.com/files/files/625592569.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1