Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eaef3c72ac79373…

MALICIOUS

PDF

107.2 KB Created: 2021-01-26 15:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a5ecd3022d38eff021c15e178a2b9b6 SHA-1: 2bfe1b73195a296e933d2e13d7979ccab15cf1fa SHA-256: 5eaef3c72ac79373d7d337c2994978eba86c61b9bad80b0e149d846c69509f2a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/wb?keyword=ancient%20war%20strategy%20books In PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/cecf2d9a5c29ae8.pdfIn PDF document text
    • http://shop-onlain.fun/totally_accurate_battle_simulator_free_download_apk_pculuut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fe6f353d54f6.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/518f8da1fbc.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/5939777.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/hiaggif/cytus_2_vanessa.pdfIn PDF document text
    • http://fabermanufacture.ru/xigewoxuvenenemoluwepgpi1h.pdfIn PDF document text
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/wolumosunoxuwus.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/GlPhgie/city_maps_for_mcpe_1._16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ff7cbcd0599c.pdfIn PDF document text
    • http://garant-ritual.online/pewdiepie_tuber_simulator_apk_mod_unlimited_viewsspa7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latosenepodukum.rf.gd/84148498511.pdfIn PDF document text
    • http://nowavef.epizy.com/49159187430.pdfIn PDF document text
    • http://xotepugiz.rf.gd/minecraft_dry_hands_sheet_music.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/20589572431.pdfIn PDF document text
    • http://goseletew.epizy.com/ipython_notebook_keyboard_shortcuts_cheat_sheet.pdfIn PDF document text
    • http://nefaped.epizy.com/39936431854.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/elementor_wordpress_template.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/carson-_dellosa_cd-_4301_worksheet_answers.pdfIn PDF document text
    • http://tutivute.epizy.com/appreciation_letter_for_good_service.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 15992 bytes
SHA-256: 9516c8b752bd6c7c35c5a6ee3a9d3fd15ec38477a8dbfcf4baf07104b2c8278b
font_01_sfnt_off00015b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B16 5320 bytes
SHA-256: e79fae198ca0d306fd51e9a2cc6956f40a27ede82cd9c93fe6cfc3312eda0118
font_02_sfnt_off00016d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D61 17960 bytes
SHA-256: c76b4075dcc101a179e75c7ceb73f74a33c645688c1faa455f324e301cc6ee98

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