Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cc561a175de037…

MALICIOUS

PDF

79.9 KB Created: 2021-03-16 07:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 659c3395737dae3db55c74c50f923073 SHA-1: 9d9131e734922b4196c3b766428b836c2d9ef3b3 SHA-256: 66cc561a175de037b76236cd2d2ed9e4a91fd9cc4daae26f23dacb87b0b908e4
66 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 domains and are associated with link farm heuristics, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external URIs suggests the document is designed to lead users to malicious content, likely as part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/strik?utm_term=were+lever+action+rifles+used+in+ww1 PDF link annotation
    • http://fb-ig-copyright.com/vfs_austria_visa_application_formk58px.pdfIn PDF document text
    • http://samettemiz.xyz/jurnal_akuntansi_manajemen_keuangan9vyh1.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pepabexofi.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/17739f.pdfIn PDF document text
    • http://thrivewebs.com/pokemon_super_mystery_dungeon_rom_3d5gn2s.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/nutiwodutakoxizoluzu.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/Aijji2S/boxoziwek.pdfIn PDF document text
    • http://copyright-rules-help.com/98451830129vr8t8.pdfIn PDF document text
    • http://morpeoplelife.ru/godoxakovd6v6.pdfIn PDF document text
    • http://yoga-italy.space/manual_motorola_moto_g7_plusdma45.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/rupazoveguken_tapabono_wevunufosatej.pdfIn PDF document text
    • http://biomanua.website/638069834967re8n.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/6hhjAii/fighting_for_freedom_book.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/fe92cff8-290f-4ced-8e89-440da458ab42/how_to_be_a_toddler_whisperer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932782f5-42f9-42bb-9f99-a5b3a2cefa22/40282695689.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/pdf_annotator_free_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2f55e9-58fa-4fd9-974c-8bfc998edcba/games_to_play_with_your_boyfriend_on_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d7e367-e983-4a0e-a21a-fb37bcd72edc/tetorebizapagipifapul.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_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5232 bytes
SHA-256: 959c9dd0a1b0a8d7909f7cadb828d686821a22da20fc9356145e7a39dd96bd47
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10584 bytes
SHA-256: 427c55da07295e3931263dfb25b6d00843a7218d1115032434ac914da731e3ed

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