Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e259e534e31d4ca…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 13:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8b986b76086cf16e0f7ed2426ec9e1f SHA-1: 69817a151f9c10ba526bd5b5496fc865f7e1be48 SHA-256: 2e259e534e31d4caa4ba2cadda2bd4dfa8893eca4d7a0e4e6760245998427864
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://kenhuffbuilders.com/userfiles/file/37844329738.pdf In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473fa340c0---45769933449.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/mumivuxiv.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/vejenab.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/33851855525.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/81724389817.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gojinotuzomewixewelira.pdfIn PDF document text
    • http://mcutech.net/files/66754708283.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/nuzazarukidowonakosepula.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/30399570689.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/panatilevijezasafibu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/14940820493.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kanilelaxepafomexigen.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dakijufuvijiwew.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210915160614.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/welawagoselur.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/54835407740.pdfIn PDF document text
    • https://kimcert.org/E/file/10637561201.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/mafefekubo.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/84820857926.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/10572661995.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210902_E8D4CBD92789B9EC.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sulilivilaposuvetamar.pdfIn PDF document text
    • http://anbc31.iscriptscloud.com/app/webroot/files/file/27216440074.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/pedonozomap.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/81388476769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tower+defense+multiplayer+androidPDF 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_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 10920 bytes
SHA-256: f8aa08df426c8dd85c62d0d29820bf84b954c95d152708a699d8535b294e56f4
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 17108 bytes
SHA-256: 51f5fe9d5d27e21210da22f4f044ecc438f0a3b2fd2a3c710196a50c70c0273c
font_02_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1