Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e15404acdd532…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 07:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59c4b4cf83b1f47e217964ec4910b609 SHA-1: d5653f00dbf184b20cc411dccbecf080703a96ad SHA-256: f82e15404acdd532b1a5b85a0d800d0366f708dedc40b54e14d065196a1fdf30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to unknown PDF files hosted on various domains, suggesting a link farm designed to distribute malware or lead users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the suspicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://antonioruizabogados.es/userfiles/file/91766682638.pdf In PDF document text
    • https://sayurmateng.com/contents/files/wekes.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xibutuworomofivufumide.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210911190455.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/47587664756.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/ladopinatutifumupumenexe.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/sisagetenuxewakidano.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/49027862126.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/27814616807.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/tilubupurir.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/bolidizarefugifuxujubuzo.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/87795542448.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/pawokurexapenukolalil.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/87833062663.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/bubevanisi.pdfIn PDF document text
    • http://rinsacars.com/files/others/13907815965.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/guxosurudewetetelisufu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dbe71d9f2---lopejifufojefovire.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/petavivuzoredudosuwokun.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/vaxuseli.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/37654700500.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16153d503ad7ff---pajibifasotetunanijox.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xidoxugijup.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/44367159726.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/29695736679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hotstar+premium+apk+download+for+pcPDF 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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 11052 bytes
SHA-256: a0a47d0a1e855f795ce93e65893979940b4b4c69e52e71970b9c0dbecf65e06e
font_01_sfnt_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 15292 bytes
SHA-256: 24028cd22f1be3865bfe36a1b357d3db0c04e945482193cae1131051b4a8f7e0
font_02_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1