Malicious PDF — malware analysis report

Static analysis result for SHA-256 236bb0b9fe05359c…

MALICIOUS

PDF

72.3 KB Created: 2021-02-12 19:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 017cc4c29273a77bbd42e15c134ebd8c SHA-1: 2860cf89b175e4e09cdb1f7349c83a817cc8f938 SHA-256: 236bb0b9fe05359c561ffa5e9885e6419804d51d74c50c8aaa29cc370cb6adc9
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector link farm. While no scripts were extracted, the document's structure and embedded URLs suggest it's designed to lead users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/wix?keyword=psn+code+list+2019 In PDF document text
    • https://wuwesojelure.weebly.com/uploads/1/3/5/9/135973580/1afa8f215f.pdfIn PDF document text
    • http://tisigetid.iblogger.org/blob_as_json_file.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fcfa543b4b95.pdfIn PDF document text
    • https://gorasanoso.weebly.com/uploads/1/3/1/8/131859135/doleda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff40bd7ef827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_6000c0350b96d.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/hphd6ge/square_tubing_rocket_stove_plans.pdfIn PDF document text
    • https://nigizamizu.weebly.com/uploads/1/3/4/3/134319440/9b34c12fbf171de.pdfIn PDF document text
    • http://vinorama.fun/league_of_legends_playtimei4i7n.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/uss_exam_2018_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hjhfjhk/50352628890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_60262d3583c8b.pdfIn PDF document text
    • http://muvirire.22web.org/92321651002.pdfIn PDF document text
    • http://istlan.space/9801797611324amg.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/JjepjfE/1920x1080_wallpaper_anime_girl.pdfIn PDF document text
    • http://moneyindia.site/bugepovemufunodadopizubtalbj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zamudijofo.epizy.com/lopomezijikuxisepuro.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/fojasakoje.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 5112 bytes
SHA-256: bb468e2df35302c37ee67a1da95c4475f243e6e486df6ebc9a7aaf7572553cd7
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10344 bytes
SHA-256: fb9af643903162ede31d78de3d86fa9adf2f4a437ccc4c6ac25d1181a0807784

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