Malicious PDF — malware analysis report

Static analysis result for SHA-256 098c4e4086d7803d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-26 02:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 22a789c31a3d52fa74f9e0dbca5130e1 SHA-1: 2de76b4b65f05e6e7257fc4249638f5ee062ca25 SHA-256: 098c4e4086d7803df388d7c5fdea4db5d2da997405c60ad78abae4810cf9ace2
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded URLs suggest a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=the+birds+and+the+bees+ac+odyssey In PDF document text
    • http://doxalasi.mywebcommunity.org/nijugonej.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/9305607.pdfIn PDF document text
    • http://ropilelerenub.iblogger.org/aftercare_tattoo_sheet.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/mimesew_nurutofexuru.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/fasofoxigatafis.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/2064563.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/fYigric/silenoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_to_use_obd1_code_reader.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_to_change_epson_8350_bulb.pdfIn PDF document text
    • http://ruzupaxenerod.epizy.com/xesefifex.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/adrenocortical_insufficiency_guidelines_endocrine_society.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/19700468999.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/daily_spending_tracker_excel_template.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 4976 bytes
SHA-256: da4fd7b98ecff1be439a969ad6ddbd08d3d0ccf0d26e7b7ba3fba1686d48214c

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