Malicious PDF — malware analysis report

Static analysis result for SHA-256 52668fd4d24d3158…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 06:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e5b5cc1c3b5619521af1cb6a22a85af SHA-1: cf36de35e957dfc0d5d069856269d1ce112670f3 SHA-256: 52668fd4d24d3158d21f5bf060e73ec6250e6903cd58d4bbcfb77ad02f3c8ac6
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 hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://varosom.hu/userfiles/files/fokasubinurepadalu.pdf In PDF document text
    • https://avenue102.com/uploads/file/risovij.pdfIn PDF document text
    • http://saint-party.com/media/file/69754049411.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/matajifugi.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/susimorafamor.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/13844882398.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/nalesazeburapulo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/vupulusutazonuvejonewifi.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/pugajademo.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/28043928263.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109040849204240.pdfIn PDF document text
    • http://mayjack.com/upload/files/75302685412.pdfIn PDF document text
    • http://test-immo.com/file/tepomatopetisosagi.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/54086231464.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/34980290752.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161459356e28cd---19846064840.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/92841247679.pdfIn PDF document text
    • https://gilbertems.com/videos/file/62842882942.pdfIn PDF document text
    • http://timebymtm.com/upload/files/54202959386.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/3399413567.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/47657490113.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/jivobiwuzi.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/dewudukugozaxedapujag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=escape+from+reason+pdfPDF 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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 17816 bytes
SHA-256: 3f03785a99e82edfdf6861dfa5e645d1d3b2e2bf7ccf191b05572b9c0919c94b
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 10528 bytes
SHA-256: df45bb12fd93d80361f6356807c63564d6c62015c6f18ac45389f83c74d831cb
font_02_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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