Malicious PDF — malware analysis report

Static analysis result for SHA-256 f903ba5e3269415e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 21:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7e4b066f5dbffe1919996c159089ddc SHA-1: c279c0ac4b68c6b38904a1fa8ecd3cea7fe565bd SHA-256: f903ba5e3269415e7f78df1885fdd227ebb4f3002de230de5c935e08e9b56980
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, one of which is presented as a download link for 'minecraft pocket edition full free for laptop', a common lure for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bunexim.dascalita.ro/app/webroot/files/userfiles/files/vajade.pdf In PDF document text
    • http://artwatch.ru/userfiles/file/miwuxawemobo.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/67052722164.pdfIn PDF document text
    • http://cudicio.it/images/file/80787939125.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/putufuxobexugezebivinara.pdfIn PDF document text
    • http://a899.net/userfiles/file/72410223543.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/57279719633.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/67575612743.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_144709.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/deneligew.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/6345796154.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nodenipasezosipalokelewe.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/40568783141.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/kobalosapeb.pdfIn PDF document text
    • http://zzquansu.cn/d/files/majukanewatowus.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8386c770b---95250763405.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xazonenimiteja.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/vujapezalegenimanor.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kesujuturudasifilo.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/gobines.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/koxetekefixafokigemuwi.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/35679830124.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/zidutetogegarakar.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/89839405245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+minecraft+pocket+edition+full+free+for+laptopPDF 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_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 10892 bytes
SHA-256: 5933e259dd6345c00ee89265743cbb208d665eeed649fb798432284c7e50cdbe
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 18376 bytes
SHA-256: f63feab8532db551742923f5134a9b2b3e0cbdd399cc4a2ba0c1d20695aa0aeb

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