Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95ae59619020e71…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 11:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb7e67b6995ceb56cd4dfe7c6ec5096d SHA-1: 03e5582407d801cb03b1ea9eef72fd16b2ce7c8a SHA-256: d95ae59619020e711433d36d5bc3dc7e96904bf303f44a77eb893d8e25c9ada8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and exhibits characteristics of a link farm, suggesting it is part of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to download a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419f76268f6---dapawozakavesorages.pdf In PDF document text
    • http://delfosventures.eu/userfiles/files/10896418634.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/68564743289.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/66725867397.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191710249569.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910092250.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/xisavexowumujimulabosuxim.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/69519209031.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/43472455396.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/34968983570.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109050856157580.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/gepaluselevusadowidetigo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/12662967672.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/bokogitipowavuwil.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dugetujovele.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sajiwigeg.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/39491165299.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vowijorukavetafatig.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lujibipakawevupopitidekal.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/53892397339.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/daxukinamulaz.pdfIn PDF document text
    • http://duef.ru/public/file/waziledagelogavolabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=file+manager+free+downloadPDF 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_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 10492 bytes
SHA-256: 082a7b146af2d8c15c274c0d8258195b84a0ad225f532c480ec88188d4f071be
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 17216 bytes
SHA-256: c51f5ac6908ec684969a7e3704c0d6c528c5a869b93c7c3084893033e41620b6
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1