Malicious PDF — malware analysis report

Static analysis result for SHA-256 639db0b12608f591…

MALICIOUS

PDF

95.6 KB Created: 2021-03-21 04:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 276906540d1f423c0fe6e7943b87f86b SHA-1: de606c3a9cd38ba5a1553d5695c0a7debbe88457 SHA-256: 639db0b12608f591bc653b7c3e30c46dcefa5347b696565b953c975db7676b6e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URIs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. While no scripts were extracted, the presence of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=mr+altman+geometry PDF link annotation
    • http://xapozekaxo.iblogger.org/pronombres_posesivos_en_ingles_ejemplos_oraciones.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/outstanding_short_stories_edgar_allan_poe.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/what_is_beneathas_dream_in_a_raisin_in_the_sun_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/WQhH3B0/59371736055.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/lezitijazawetebed.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/zawevivus.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/tutorial_on_python_programming_language.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/jiiggfw/rigetenezuvemasa.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/wijadalufuzesugef.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/bhabha_scattering.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/D2pibmy/36424705425.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/arcana_chronicles_book_1.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/Omidujb/nba_2k20_soundtrack_update_4.pdfIn PDF document text
    • http://lewuvajenajen.iblogger.org/alphabet_wallpaper_hd_s.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/hjhi6FJ/texodirekolofunexexivigot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipabadidori.epizy.com/spelling_and_grammar_check_free.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/springer_books_free_download.pdfIn PDF document text
    • http://zopukugabem.rf.gd/f_b_service_knowledge.pdfIn PDF document text
    • http://soxomidil.epizy.com/sezilojer.pdfIn PDF document text
    • http://zutotakome.epizy.com/mowawepovuwor.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/life_history_of_david_maraga.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 4936 bytes
SHA-256: fc62bcc27d8a7d0a1c7ed354dd1829fd2754b1407b2ad014cfb3e60d46f2c7d5
font_01_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 13348 bytes
SHA-256: 5230bfc2be40b212cc2a22d2fcb9d2e6371b4e086442d8c9f99954f0889763dc
font_02_sfnt_off00015a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A93 16340 bytes
SHA-256: 805ecb10edeeffdab1fb78c069fc72cd803ef9dc3427960b4996647329518b5d

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