Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5b7e90a94a4c84…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 02:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c0073b09fb3c707908abfc03fcd6b62b SHA-1: 957513792a41b6af636599431d372cffb1deab65 SHA-256: 7f5b7e90a94a4c84c128d1194ea1cf809bff448bf964120a8df7069f6d235571
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of external URI indicators and a link farm heuristic strongly suggests the PDF's purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=class+editor+apk PDF link annotation
    • http://ctcinsulator.com/uploads/file/79335502035.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/bovifesinutad.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cae91dc9d---nomejirakukig.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/vifawuweliwifinex.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/14017927358.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vesopefopitoxese.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/21648893261.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/zukoxasewivofatuja.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/liwarururejifutewitokovi.pdfIn PDF document text
    • http://dalaichau.com/files/4449848389.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/vugiwidagumixajimebu.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/60601325627.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/lexonexugezatanedux.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/96198213418.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/xabunuvimitezetafipajos.pdfIn PDF document text
    • http://liily.jp/upload/file/20210929072411.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zenuputazabiva.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/30b7468633a1217f374ccfc7936fb1f4/lodonebunanoruxuwirazez.pdfIn PDF document text
    • http://atya.eu/files/file/fewawefiwap.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/17063283050.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/notimewaduroge.pdfIn PDF document text
    • http://samtekelektrik.com/files/95803729987.pdfIn PDF document text
    • http://www.celso.org/download/40538642288.pdfIn PDF document text
    • 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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 10404 bytes
SHA-256: c848c15f3c6a28df15a1e4542542c5496e90b081f11c78c6a31f1c8b43664cc2
font_02_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 18688 bytes
SHA-256: 3af9ef42e8810b23a328959cb3da758bc7acc76ec15393829ca6eb741f24ddfe

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