Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede2cdd53050bf89…

MALICIOUS

PDF

84.4 KB Created: 2021-03-18 13:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 63dc93edc536ac425c08101d7559a868 SHA-1: 0c9aec1f8b5b9c6b15242aa8d4c63ac117fc88c7 SHA-256: ede2cdd53050bf894714757ddc2b868f8d1e6a90e72db1ab80d8e97a38764305
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/wix?keyword=monohybrid+and+dihybrid+practice+problems+answers PDF link annotation
    • http://italystore.pro/karesikugosorubudifegejabhkkf.pdfIn PDF document text
    • http://gobigs.space/how_similar_is_the_witcher_games_to_the_bookstud12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6029a74cddcc7.pdfIn PDF document text
    • http://doorstepcomputers.com/nibajepup1qz00.pdfIn PDF document text
    • http://redpandarecycling.com/6386593859865evr.pdfIn PDF document text
    • http://classicalnaturally.com/touchdown_game_onlineocxl7.pdfIn PDF document text
    • http://mikrotikwizard.com/argument_from_desire_example_sentenceiilz3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6053327958f52.pdfIn PDF document text
    • http://1gusevshop.space/ginifivusumasomn7u4.pdfIn PDF document text
    • http://callup.today/google_my_maps_offline_nutzen8br54.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/d3f04647-8081-4cf3-9a95-18205f589b5b/how_to_restart_an_ipod_nano_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ae95fd-0f88-48e8-bad4-9d18a4ff4db0/the_girl_with_the_dragon_tattoo_series_book_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b3dbcb-9285-4ec9-b08e-762943ce3be1/big_green_egg_minimax_charcoal_bbq_bundle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c238a60-89e9-4cb0-9d96-2284aa499e25/my_voice_will_go_with_you.pdfIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_ce17ba79e1774c17ba92a2654d720a21.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_c49cf07f35594964b190cc598cef1063.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_3d1383603c1841af8c0a2cd4efc95d4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf076dd-7ff9-42f1-b67e-f17fbc078745/62253463414.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_8bdbbc68ecec40adb7e60c644fdf79a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9434293-0e6e-4052-96dc-8373940b0c9d/45531459367.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_ad02f77f1cfa455d91907c981acf530a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c712c6b0-a427-4c7a-9d40-aad9dbb00ba5/is_there_a_cloud_etf.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_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 5652 bytes
SHA-256: b740cfeb0dc7e12b61461a108eb7952652a62bb6a725120398bc6dea1459febd
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 10928 bytes
SHA-256: b85ef0166b67b2cb5a6f1c273a83f9d16f0b1759803dd002a6d5595113c1f715