Malicious PDF — malware analysis report

Static analysis result for SHA-256 571fb40b414f9afd…

MALICIOUS

PDF

72.6 KB Created: 2021-04-04 19:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da1057a6317d826897cd5647e10cdf6b SHA-1: 60c20a3c7df5e1f3e03be38d44885cc6ea2591e1 SHA-256: 571fb40b414f9afda8dbbf5473274318099931eab83c0d5368d7e8cc856d3923
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one notable URL, 'https://maypoin.ru/strik?utm_term=finnegans+wake+menu+springfield+mo', flagged as suspicious. The PDF also exhibits characteristics of a link farm on disposable hosting, further suggesting a phishing or malicious redirection attempt. No scripts were extracted, but the overall structure and embedded URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=finnegans+wake+menu+springfield+mo PDF link annotation
    • http://sfr-espace.best/evod_battery_flashing_red0afk1.pdfIn PDF document text
    • http://tupujetu.sportsontheweb.net/54303387894.pdfIn PDF document text
    • http://bbflowers.net/19061162753hsz3o.pdfIn PDF document text
    • http://xumegexujarev.22web.org/adventurers_league_dm_guide.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/detibusisab.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/the_chronicles_of_narnia_the_silver_chair_2021_movie.pdfIn PDF document text
    • http://summ-green.fun/22259083376yxzvs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_2da2b610016f48a39976fe867ffb2a54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/california_citation_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81e5dfa-a3c1-47b9-9bb5-7edee2695af7/what_is_formula_of_mean_median_and_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/romance_novel_story_books_for_adults.pdfIn PDF document text
    • http://dagalukuxi.rf.gd/juxewukiveburibetil.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_aa54d770477b48ca8faed197c514feb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4a04fb-b0fa-425b-bd51-b6f2aa9ca529/22662585557.pdfIn PDF document text
    • http://dazoxamawix.rf.gd/child_labor_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81def3bb-c3db-4981-8fa0-dbdb6b4f79b3/chamberlain_liftmaster_professional_formula_1_troubleshooting.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/mawewamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66adc958-abb8-4ddf-9fb0-dd534286034c/how_to_install_a_furnace_filter_whistle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f9a792-8c54-4d91-a9ab-55c71ae70863/68604963643.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/57542305141.pdfIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_0fed76d00b284ab5982945b3c96dd854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/o2_voicemail_setup_android.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_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 5472 bytes
SHA-256: b1c258d98275b20330918ad2e564c75584d041cb502817f4185114da3432e423
font_01_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 11236 bytes
SHA-256: 2a056c7b5608541be5a7a8f4aa9b6f3f0b79dc83af77d46bcb694e60d0921cde

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