Malicious PDF — malware analysis report

Static analysis result for SHA-256 40126e4cf12b212b…

MALICIOUS

PDF

78.1 KB Created: 2021-06-02 20:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 43b3bdd7ddbec4b94325e132607515d4 SHA-1: b6422e05df83c3b1fe5ef83296b8cbef070fb4b5 SHA-256: 40126e4cf12b212b89c8ebe18f5c306427fe94142c3bba7016e18bcc1a027cc5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the heuristic findings of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nomylo.ru/pbw?utm_term=tradu%25C3%25A7%25C3%25A3o+pdf+de+ingles+para+portugues PDF link annotation
    • https://jogosoti.weebly.com/uploads/1/3/1/4/131453036/vijenivu.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/bazesixutirexi.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/nesaxugatepotog_dodegalupi_nadudokew.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/zebosuz-wanala-jomazedivorew.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/6741e95bec71.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/pexilidawepobov-ripejufa.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/8434877.pdfIn PDF document text
    • https://razavewi.weebly.com/uploads/1/3/0/8/130813306/jurawoniwut.pdfIn PDF document text
    • https://mumojugaweweran.weebly.com/uploads/1/3/1/0/131070520/gaveweduxuwovadok.pdfIn PDF document text
    • https://teravotizu.weebly.com/uploads/1/3/4/3/134335056/risovupijabunas.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/3610553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9de866-79d8-462d-8655-6150d6d8c7f5/roald_dahl_audio_books_the_witches.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/moworajefaninep.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144455472/roblox_level_7_script_executor_free.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144466842/11479542671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751bda95-5578-4f9c-9c73-20140ca5ec59/12305757167.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144427119/butuxepube.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144437880/16998743897.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/59451785835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fb3678-ebe1-461f-b4af-34102b4300c1/93437060230.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144418524/nudexumu.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144423351/what_is_the_significance_of_the_title_to_kill_a_mockingbird_essay.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/f/simbolos_de_tablero_carro.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144497808/alcohols_and_phenols_lab_23_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4931c5e8-f76e-41a8-ade2-fd906e0a094e/eheim_fish_feeder_petsmart.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 5660 bytes
SHA-256: 93bb0e26e30e6be86c9549b245efd5dfb441fd64f7904492eb297be2b5c39fb1
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 12964 bytes
SHA-256: 6df8e6a4b15cf2734818214fa55bd059a5005ff0a56785c89d9188e03f5bd95e

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