Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f6f18b6a5d2b65…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23338ff6d3f8451bd035fb129d1db0e9 SHA-1: 857d40883df8622309b13f2a9843f8b6a4ec8e55 SHA-256: 05f6f18b6a5d2b65c79b65e73e906aed92eab52a0304eba78b00a9ebe4ea5e77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs suggest a link farm or redirection mechanism, likely to host phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ammk.sk/userfiles/file/6830013758.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/medevijovuzapotupimedon.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/malatuterepeka.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/23388136122.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/98625960935.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/61a3f342b71841d7b006863525aaee4b/lofigelek.pdfIn PDF document text
    • http://adice-area.com/pictures/files/92784050890.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/tufinuserawonuvomiza.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/xudilosubekawugim.pdfIn PDF document text
    • https://senegal4d.com/contents/files/73735296576.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/9338764599.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/lodoxog.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/rurutifusubepevidubi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/dumomosonirasixixeb.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/30715398521.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/getuwupababejoripaduxa.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/wosuvobobogi.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/66378357163.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ddbd7bc9e---88948368574.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/73227389952.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/17480236306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+can+i+watch+the+fight+on+firestick+for+freePDF 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_off0000ac2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2E 10736 bytes
SHA-256: c8a24e102215007ab543c117a691845a1d5df82dfd7e681d98ea352a66d7da8b
font_01_sfnt_off0000c4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D7 16796 bytes
SHA-256: 57703d00c75428677da8ba889f5215718aaddf9a92847a0ed9a6711aa10756c4
font_02_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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