Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72f753cf0354b23…

MALICIOUS

PDF

82.0 KB Created: 2021-04-07 06:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a66da8d44c33fd6214134be097df2d SHA-1: acf7c8161163a30498d476184de2243777a2d699 SHA-256: f72f753cf0354b23fc0d9591ee3faa83239a0801714e308ee9d598da2cdc6be7
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=sistem+reproduksi+manusia+kelas+9+pdf
    • http://vknart.xyz/jesoxufofakafesagapevovutcz2ev.pdf
    • http://puxekera.22web.org/defejat.pdf
    • http://dimakuvojekoko.iblogger.org/fanejagiwuwuvatabida.pdf
    • http://niwopofe.scienceontheweb.net/example_of_data_analysis_in_qualitative_research.pdf
    • http://lnstagramcopyrightcenter.com/misined7qc0r.pdf
    • http://lubevos.scienceontheweb.net/english_grammar_articles_worksheet.pdf
    • http://telovajov.medianewsonline.com/zafapuzipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zalomi/maradona_malayalam_movie_songs.pdf
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_07872734a240408a9975ffb38605cd28.pdf?index=true
    • http://romuwoturifitam.epizy.com/bupaxivet.pdf
    • http://nowawomapevoxo.rf.gd/what_is_the_highest_scrabble_score_ever.pdf
    • https://uploads.strikinglycdn.com/files/ef25a46e-e3ba-4d5d-96e3-648c17c0d35c/am_j_respir_cell_mol_biol_impact_factor_2014.pdf
    • https://s3.amazonaws.com/kiremefegonar/online_admission_form_for_college.pdf
    • http://rosajeku.myartsonline.com/how_to_teach_basic_paragraph_writing_2nd_grade.pdf
    • http://gagoxuxu.rf.gd/48557800744.pdf
    • http://faxiruvud.myartsonline.com/28047574465.pdf
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_d20c864928cc4a72842525056b62abe3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c42fc061-0829-4f27-ab76-efdd796bbea6/how_to_allow_flash_on_chrome_android.pdf
    • https://s3.amazonaws.com/xepululejiwof/life_skills_grade_5_worksheets_term_1.pdf
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_a74bb2b0a5124d468810151efad95519.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_f7742a66af9148ca8582c508ddb80624.pdf?index=true
    • https://s3.amazonaws.com/vutame/character_creator_2_crack.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010077.bin
83cbed9312a7cf9108099279ce8ecab4e7fd8ffe64eb8b3c5a5a88806335a746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 5512 bytes
font_01_sfnt_off0001131b.bin
115be657cfdd0cca0ad5e4c7a0d4b3afec1d7d036aa7d53f39861dbb45e1aca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 11184 bytes

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