Malicious PDF — malware analysis report

Static analysis result for SHA-256 636b6425f260048f…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 10:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 006578cba69f64f620dc6100e483def5 SHA-1: b4a7c812ef5f960c9b1faebebdc8f3c9e03d46fc SHA-256: 636b6425f260048f9feff31f9cfc6e09ab478f8e906f9c34cc0ffa3a8c1379e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=discovery+medical+aid+plans+pdf PDF link annotation
    • http://netmode.net/app/webroot/uploads/files/ruxusazaguwajadegavexugam.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/3507373617.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/68164270890.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ffd53a4d6900676c5dcd8ab4ed33cd67/sefesavodezeleveg.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/18521858829.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/savabesosulisikiwanegalax.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/50574057573.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tikibis.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1b98dda35edcd9a4088d75976b8f6357/vekepejajekaserojomux.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/jutixubixusu.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/85836971417.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/tizusapibisabetu.pdfIn PDF document text
    • http://ave-france.com/pics/files/kuvesufebezilolaxako.pdfIn PDF document text
    • http://midospa.com/upload/files/zaduxujudi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/70166229624.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/mekedosujirikupif.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/7668517974.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/tozugovasobapirojemo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/sixumomusubipav.pdfIn PDF document text
    • http://novichiha.ru/pic/file/galejogidala.pdfIn PDF document text
    • http://chongros.com/userData/board/file/55560444340.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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 10864 bytes
SHA-256: 7ca91b859f27e11caafa6e38c174e4e7c108d05cae8d85af00734a250ba114d2
font_02_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 16636 bytes
SHA-256: 58be4c4b14ff3133bfd029e2337f4344c19d237fe1410caf2ef6c8a18838126b

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