Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5328d2b29cdc1d9…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 00:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b325e62d12823a501bdf939e7796a564 SHA-1: b1a4646d8de797e70c1d1491c7db613cd323f6c0 SHA-256: a5328d2b29cdc1d981fadc27b03bb3e16d4585cb8249f5d098a257198aaf97c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that serves as a lure.

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://botokaw.ru/strik?utm_term=where+to+buy+replacement+bowflex+rods PDF link annotation
    • http://mewudaguzexo.sportsontheweb.net/ampicillin_davis.pdfIn PDF document text
    • http://xutusurekawidi.medianewsonline.com/wediradezuvozu.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/catalogo_filtro_tecfil.pdfIn PDF document text
    • http://fixegemixinazoj.22web.org/lexokazumevufedusetava.pdfIn PDF document text
    • http://xudozuborupi.22web.org/wix_embedded_mysql.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/2682569.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/kemiz.pdfIn PDF document text
    • http://smartroom.pro/what_is_social_thinking_autismflccx.pdfIn PDF document text
    • https://ruvudiroxutorag.weebly.com/uploads/1/3/0/7/130775702/raligovodip.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/3d_animation_books.pdfIn PDF document text
    • http://reduslim-official.website/asine_house_remixtvzit.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/5069125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixudilasajigil.rf.gd/70785984677.pdfIn PDF document text
    • http://wezekopufoj.rf.gd/add_ing_to_verbs.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/ahmadiyya_books_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0931f7ef-e6f1-4471-9822-91c114f4bf81/67875473057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad93ffcd-5b8b-4092-a0a0-04f31a77f31d/max_lucado_books_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3941fe79-60a8-4b86-9845-7180686762b9/nexozojupifulatutifegasiv.pdfIn PDF document text
    • http://suwugiborewetel.rf.gd/38141982375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfcf64b-9290-4b74-86fc-3f1f18a7eb44/can_i_buy_nespresso_capsules_at_costco.pdfIn PDF document text
    • http://melamodusede.rf.gd/javascript_blob_name.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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 5812 bytes
SHA-256: 924fcf8444f41fbb83a60c99d06488930db91469aeeaeb82f6ed8634c3b0f4dc
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11476 bytes
SHA-256: 4566d0e13f50a0cb209d178caf7ed06722cef3e14f6597c7036a2d3e91643cb4

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