Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b04146c7aaa69d…

MALICIOUS

PDF

90.9 KB Created: 2021-09-20 09:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d44889150eafe3956627688c9b384fa3 SHA-1: a380017d5030ef23e932d491d5fe01953602d3e6 SHA-256: e7b04146c7aaa69d0ef6011bcc28ad530474bda3a7326c444d0942bfe72f00d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially malicious websites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=come+cambiare+font+su+android PDF link annotation
    • http://zxpgw.com/userfiles/file/37713826647.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/vofoba.pdfIn PDF document text
    • http://scro.ru/pic/file/49945657865.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/vesavirul.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/37687500742.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fuzizaniwim.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/38099228661.pdfIn PDF document text
    • http://373113.linker.tw/files/kakovuratuxusadalelajam.pdfIn PDF document text
    • https://korankertas.com/contents/files/18512009217.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/27673000168.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/mixepaxamanakolatofe.pdfIn PDF document text
    • http://goldmustang.ru/files/files/88991367300.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/17981011492.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1993731195.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/80816259574.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/kanofofogilafoposopizu.pdfIn PDF document text
    • http://receptlap.hu/files/35205441314.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/80100626838.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/posaloletirodede.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f668bdcdd0dd9a451104f3e8902c2574/24961748307.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/59944331484.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/fixovamepoluw.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/39263905439.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/97552551157.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fesodojezelidevim.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2ac51cee2467cf6d33429aa7034ed3f6/memejena.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_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 18004 bytes
SHA-256: b985197239901fbd3b1add49d6c75d9e3011ac6a6f63f69932d7b5d2fbffbd28
font_01_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BE 10860 bytes
SHA-256: a0a9123e795dc72e38233088d0a5ba62bd68aecda16c79fbe5c1ec117618a937