Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b818f8aaa9dc7a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 13:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85745968d7f81d1389af74ad2f93120f SHA-1: 1b4cb5e722e2fcde4b949f685b985abfd5521e68 SHA-256: 76b818f8aaa9dc7aece9f5a4afcb826df6f7281cc98f58139adecfa091f04715
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a lure to download further content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into downloading something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://rm-parketi.si/uploads/38721417745.pdf In PDF document text
    • http://ctkupavna.ru/upload/file/4068996130.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wuvazonifaponodenanejiwa.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/vufawegidivemafovesevejil.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5347e1f5---rujufafitadudemofubevorar.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/71706106295.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/70700411793.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/21405814234.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/darefowiw.pdfIn PDF document text
    • http://www.pvvc.cz/files/26674486501.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/surogeparepovukuladaj.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/37976812618.pdfIn PDF document text
    • http://ministerium.pt/files/fipenif.pdfIn PDF document text
    • http://meskerjager.nl/media/files/didabidupo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/meterog.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/95676207725.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/nukofiwi.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/mikitov.pdfIn PDF document text
    • https://afayl.com/userfiles/file/velegevup.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/divin.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q1483e4admbsmn8r3mdabgo7e3/jojawosipi.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pepitadetuvujupexovewoko.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/29801559046.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/39670647033.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/togolixuluguvinisivaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lord+i+offer+my+life+lyrics+hillsongPDF 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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10732 bytes
SHA-256: 8c9d871d7d40561a7239f4e4557c86e4ab42927fa715768ffd824d5e885e2359
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 18640 bytes
SHA-256: e0e31195355f3c1323c1aec5756fb9c8a73af0236ca6056ad6b383cb02bdb3f1