Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c086b04c8868088…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 17:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 305f415156db794ccae557bc0dd1b34d SHA-1: 50e9094d15d677c2552d433772042429e2494494 SHA-256: 2c086b04c88680885ca76b6ca848fde8da4911b6f258bf300a3dde6b0ebd0625
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/award?keyword=s%25E1%25BB%25ADa+file+pdf+b%25E1%25BB%258B+ng%25C6%25B0%25E1%25BB%25A3c PDF link annotation
    • https://cdn.sqhk.co/fagiseregu/gXdjsss/bella_s_kitchen_fever_simulated_cooking_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/fjijbwd/free_printable_carousel_horse_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/JidhfiS/.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/19946721067.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/Lihhgjj/call_of_mini_zombies_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/iieprig/real_steel_2011_full_movie_download.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/vaxasu.pdfIn PDF document text
    • https://cdn.sqhk.co/zixedagiro/8ibhjgh/clean_road_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/fLgj6tU/28742162346.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/icjgYkO/muxunagisefononu.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/sistema_renina_angiotensina_aldosterona.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_e84aabe44e514ad6a1d5cc602e3d5e92.pdf?index=trueIn PDF document text
    • http://rokidibamufoduv.epizy.com/balancing_equations_quiz.pdfIn PDF document text
    • http://bevamixebigal.epizy.com/contractions_in_formal_writing.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_08573a72cf6b4fedb9d78133423cc603.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/91413187025.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_4f786f11da56475c88c7e78c3aba1c2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/acer_aspire_e15_review_ph.pdfIn PDF document text
    • http://pumuroxojab.rf.gd/ielts_target_band_7_book_free_download.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_fc2afdde8d4b45cd9f6ddd3713b161ef.pdf?index=trueIn 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 5836 bytes
SHA-256: bf954539f45297f77850af651f178251ec3bfc8b0a00a95bf58fce02a372c184
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 23756 bytes
SHA-256: 275a1f9d1625a2218adf8338e121a933439d22f37e550d6ba59a5042ad234e8c

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