Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc455fec3d52b1ad…

MALICIOUS

PDF

82.2 KB Created: 2021-10-05 14:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 47b6bf34b466287a878cb2836bc2e6d7 SHA-1: 4c59742aa4c22661a210eb0254f0f6407a0b0ca2 SHA-256: fc455fec3d52b1ad5681f2149bd4573119d9f735c4125aa5b729b87c5ee301dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://portalkucharski.pl/app/webroot/media/files/48400648323.pdf In PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/nakulenilujori.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/49800658098.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lalefetinekosake.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f58bc21b1---geputagenarakopujixivebo.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/41237492662.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zinuramuxiganekurox.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34350680950.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/59291620147.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/dotejirejodasopagalosogon.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16308195521343040538.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210901_165326_1988.pdfIn PDF document text
    • http://azizolace.cz/images/file/67334742484.pdfIn PDF document text
    • http://caratow.be/userfiles/file/saruwerifogomirufagu.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/pelafuzopamuwuzunatizovaw.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/dobisipivoxonexumatagaf.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/dibakonudozunuxoteromoxo.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/65776613231.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/fusirijajilowedejuwumir.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b524606f0fd95f7869f723da21a045e9/96758408024.pdfIn PDF document text
    • http://lukinserv.hu/file/gubavereluvibarabisuvaj.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/61534133409.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/25925125710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=batman+a+death+in+the+family+reviewPDF 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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 10648 bytes
SHA-256: 889b478a653c45830424c6721265f73c944bf426aff9dc20fecfc002c6bab115
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 17744 bytes
SHA-256: fc0efefed6566bc62349d71fc856ffb713fe00abe9944b31da3290774ecfa56d
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1