Malicious PDF — malware analysis report

Static analysis result for SHA-256 812fbad8f5f5f177…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 13:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 559711e98ff266a13744c250fb5a8684 SHA-1: 764c4db49c7913c9bd8386089a180d3e938b29c3 SHA-256: 812fbad8f5f5f17723200337498807717a5834a162d59f98b9eb0f22f8bb6bb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or redirection scheme. The 'wkhtmltopdf' authoring application and the presence of numerous external URIs indicate a likely attempt to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=parametric+and+nonparametric+tests+in+research+methodology PDF link annotation
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/30573116205.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/nolaxejaxefobasil.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/gunetatejovuj.pdfIn PDF document text
    • http://classtool.info/upload/files/zerusiwafi.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/basidexe.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/25590735562.pdfIn PDF document text
    • http://come2menorca.com/images/file/23824191701.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/32232792210.pdfIn PDF document text
    • https://lemondedelaura.com/userfiles/file/vorodovamejofawopibov.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/nawiziputileroni.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/64245484970.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/51569114107.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/11685548265.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146d56d9c523---77533181464.pdfIn PDF document text
    • http://cityyeast.com/userfiles/file/30117990159.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/11797235232.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/97240896792.pdfIn PDF document text
    • http://starma.pl/files/file/4012762067.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/supemogopewixinujuguparu.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/64717351521.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/53738782656.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/pevov.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/46079544460.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kizegufipetejuv.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/mevejosatofufabugibu.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/95861644860.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_off0000b380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 14804 bytes
SHA-256: 3e154b5acf46c690a4d2a84f4209858283cc700008523e77e026b9d06dc89129
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 11076 bytes
SHA-256: 1efe539b31718e2141ae2dd24f6d1e7d1982d4b15d7058753e7788a720ff3a15

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