Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff2227305f86107…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 11:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10070032df81d2bce6618c8e66d7d136 SHA-1: 7e988d34ac73aaa5210b69ae0b61ab994ddef0b8 SHA-256: 6ff2227305f86107d161100e30852743ec5908ccf43dd0e6be90ef131e822eb2
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 critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates the document's purpose is to host a large number of links, likely for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=singer+simple+3232+stitch+guide
    • https://cdn-cms.f-static.net/uploads/4413473/normal_603f50d920d35.pdf
    • https://cdn-cms.f-static.net/uploads/4464080/normal_6027074e5fc36.pdf
    • https://pimejowutaviju.weebly.com/uploads/1/3/4/4/134495028/822f6e42.pdf
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/23eea6e932fead.pdf
    • https://mirafovunezozur.weebly.com/uploads/1/3/4/3/134339146/wotilizoni.pdf
    • https://cdn-cms.f-static.net/uploads/4369310/normal_6046112db0ba1.pdf
    • https://cdn-cms.f-static.net/uploads/4393370/normal_600bcb4009411.pdf
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/mesazutes-xokukif-bapez-dunopinofarax.pdf
    • https://cdn-cms.f-static.net/uploads/4460243/normal_5fdc3fdce9c77.pdf
    • https://gibimigiwu.weebly.com/uploads/1/3/4/7/134748980/04374ad0427.pdf
    • https://fomofasagulak.weebly.com/uploads/1/3/4/8/134860280/fabonivadexunasefeg.pdf
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6014e433013af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jufebiwewizeza.rf.gd/wugen.pdf
    • https://s3.amazonaws.com/vebenok/goodreads_apk_mirror.pdf
    • https://s3.amazonaws.com/rizoli/95832299356.pdf
    • http://kepipejesa.epizy.com/free_printable_spelling_worksheets_for_grade_1.pdf
    • https://s3.amazonaws.com/luxaduzimase/sunisof.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/13th_finance_commission_report.pdf
    • http://renabije.rf.gd/javascript_open_blob_in_new_window.pdf
    • https://s3.amazonaws.com/tarizirefevifab/tosanebefurabiduku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64e.bin
1f3f56acd6246073f2f55c42990ec147b21bcf1e7a1d02d92d50a1c504e7cc4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 5676 bytes
font_01_sfnt_off0001096f.bin
8d721a102282c5b8bec6d4ce653a7eb129c547bebb7ef1f0b349040d12e0b6cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 11072 bytes

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