Malicious PDF — malware analysis report

Static analysis result for SHA-256 547b1e5ea812f49b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 18:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74c78377c8e05a904d2d17948ccc6f08 SHA-1: 728d18c0652f5f5bd5572b011766cb312fb48874 SHA-256: 547b1e5ea812f49b7b4b7fa71b80b1ab52afa69d6ff656c236d843e6eacba15a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting, indicating an attempt to redirect users to malicious sites. The PDF's structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=purple+hibiscus+full+text+pdf PDF link annotation
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_35D22E04933600BC.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wepaxu.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/fegurenikebewabudaj.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/tadokamunovugixigenibusa.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/bipetavufizusunowitug.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/vupoma.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zefovupamaranezuforus.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/kixilawoku.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/76331310804.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/12385504921.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134176e998be---govadonobozozaxomapebes.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gojinotuzomewixewelira.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vatired.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/151105201792.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vogev.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/jatejanazuruvoja.pdfIn PDF document text
    • https://dukupahit.com/contents/files/vamogijodebonewij.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/34405247699.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/27382789571.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/radepez.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/kasujeramejupexixaliran.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/85128831164.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/govebata.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/zubonerawalogovuzi.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/jesim.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_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10672 bytes
SHA-256: fd32a5e428fbfe6495b5d9f8739a5481e2553a993a714097677faeb7f26edfbb
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 20952 bytes
SHA-256: 30676147dfde92803dcc5054f21274e981d1a3c88d3a52aa0543f4b7e0adc86c