Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5eee52ad6d15a4…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 18:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010dfcf0e5042075b2184e83ffe57d1b SHA-1: 3cf4cc53229502e3a9250969c196ff22acc1c818 SHA-256: ba5eee52ad6d15a41f7efa53b78a0f5bd7948c0ca41dbbc0a67fd0051a46983d
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a video game, designed to drive users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://druttle.ru/strik?utm_term=will+mario+3d+world+be+on+switch
    • http://sopafekidis.sportsontheweb.net/handbook_data_envelopment_analysis.pdf
    • http://morasuxod.getenjoyment.net/sobarukuxoto.pdf
    • https://cdn-cms.f-static.net/uploads/4379732/normal_60371c7d32b56.pdf
    • https://cdn-cms.f-static.net/uploads/4475204/normal_6051f1c331961.pdf
    • http://tosefabebiribow.scienceontheweb.net/rabirerasonewub.pdf
    • http://sarawavenudiwap.mygamesonline.org/jk_bank_exam_syllabus_2020.pdf
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/giweb.pdf
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/3417840.pdf
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/lokemegegikadako.pdf
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/1e86baeebc7f.pdf
    • https://zipezeroluxufa.weebly.com/uploads/1/3/4/9/134904793/bc4c49282.pdf
    • http://vodabutopidaru.getenjoyment.net/98890756934.pdf
    • https://lakaporizad.weebly.com/uploads/1/3/4/2/134234628/553e1.pdf
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/vosuwosonetovi.pdf
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/nesadiwati-tedib-barofit-vilulezo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rubidokezive/formal_definition_of_affordability.pdf
    • https://uploads.strikinglycdn.com/files/3af2f6d3-de52-468d-8f8d-ffa801317a04/who_is_the_killer_in_dark_netflix_series.pdf
    • https://s3.amazonaws.com/tezude/lurerimuvogolepi.pdf
    • https://uploads.strikinglycdn.com/files/74b507f6-0ea7-4a2b-af1e-b5b54a8d3b74/how_to_use_the_black_and_decker_air_fryer.pdf
    • https://s3.amazonaws.com/ragejufa/makita_plunge_saw_with_guide_rail.pdf
    • https://s3.amazonaws.com/zasepo/66155324051.pdf
    • https://uploads.strikinglycdn.com/files/c56e4719-882e-46b5-9290-5466eddfea64/why_will_my_samsung_tv_remote_not_work.pdf
    • https://s3.amazonaws.com/jasadavebaga/2238355462.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e979.bin
e56dcf38385b6fbce81e3cb85adb57a9dc9a371d9682503effe1ffb83c4051db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 5588 bytes
font_01_sfnt_off0000fc61.bin
efac76c89379028a06083f3bf246d6120c1a48f16a3cf008e571de8668eb0d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10892 bytes

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