Malicious PDF — malware analysis report

Static analysis result for SHA-256 863f9b80cb474ecf…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 10:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df43c40e585adc0ff9f205652f75f543 SHA-1: 379ec663b90334062c225841b277a115fb933f0c SHA-256: 863f9b80cb474ecf0fa8dc46cad44e334fa2e1b0560e0b37324c82150d415ce6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of numerous external links, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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
  • 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://arichaindia.com/userfiles/file/57727731642.pdf In PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nidakegur.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4891a4a92---42042463544.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nufiwadarudufejuleku.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/likijejexozosebuledaxu.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fobositofaned.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/2201729047.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/fovaninumoviw.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/18316564116.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/26571240662.pdfIn PDF document text
    • http://freeski.hu/freeski/file/tenomivakikuloterigewi.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109221558278894.pdfIn PDF document text
    • http://secoinblock.com/upload/files/28980427596.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kutamunuregerabova.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/5651704852.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/legasi.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/76204016416.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/piwapogug.pdfIn PDF document text
    • https://tepihtrava.rs/files/mizozoxewavi.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/fuvaku.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/vozonafodejag.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/rubusomokapudij.pdfIn PDF document text
    • https://777mto.info/contents/files/tewiwowujukibujezokurog.pdfIn PDF document text
    • https://harom.ro/files/file/8563712459.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/62442616083.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/41317847534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+screen+record+on+iphonePDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 17316 bytes
SHA-256: 20864f9582fde8bbb14855f93883dd4a0dd633471d454d16a80037e980e69d48
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 10480 bytes
SHA-256: e0d5e1c07e897f0c3166c8b8c2fa74eaec9c7fb182f83f3cf8faaf343169ff87
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1