Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3a5590338b8895…

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 03:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 547e4b643e8c5aaadde868459eae4695 SHA-1: 855a6758422d3e55b2945e2d520028dc6d2568e3 SHA-256: aa3a5590338b889519548279fca4e04542253516b595598d98bcaf869bd76537
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=graphing+quadratic+functions+ppt PDF link annotation
    • http://nuzadovokebin.iblogger.org/67693438185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_5fe7c1ed1c228.pdfIn PDF document text
    • http://mezazasakejel.iblogger.org/academia_vampirilor_vol_2.pdfIn PDF document text
    • http://gukapeb.iblogger.org/jio_phone_recording_app.pdfIn PDF document text
    • http://delayikapy.xyz/60476913060sseop.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/infection_preventionist_certified03oi5.pdfIn PDF document text
    • http://astrology-personal.online/ace_force_joint_combat_hack_apkcg3jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_60260ff847cb5.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/american_historical_fiction_books_for_8th_graders.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60143a248c977.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jovukanuwu.rf.gd/a_single_shard_chapter_12.pdfIn PDF document text
    • http://jizizubusede.epizy.com/are_inflatable_hot_tubs_any_good.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/84760995665.pdfIn PDF document text
    • http://damoserik.epizy.com/lukuvidotipedulikibowise.pdfIn PDF document text
    • http://naresukewuvaz.epizy.com/allahabad_university_entrance_exam_paper.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_off0000d46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 1784 bytes
SHA-256: b372c6a4c0b5f49610f4a0ee5af462de4d5e81dbe3084aee2d478dff21ef1c75
font_01_sfnt_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 5544 bytes
SHA-256: 08bfd2fdf45e4c6c93a296c770aa8aba3ddf3edead4b942a8d1f59e7e8cc270b
font_02_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10948 bytes
SHA-256: 1d291132409856d8a76bcaa6b118d6f588be460d8986b5149f82a64c1aff0f8d

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