Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf16d9b0468a94b…

MALICIOUS

PDF

75.3 KB Created: 2021-04-16 14:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a3daec70e857a4b35664c2316675259 SHA-1: 28645ad9338849e5f4507974a860008d25c10794 SHA-256: cbf16d9b0468a94be8b4f38c2c5b4b954776aee2bcaf4602bb79464be49c1c1b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+change+the+time+on+my+nortel+networks+phone PDF link annotation
    • https://cdn.sqhk.co/suxavawudomo/jaEhdgY/rixogasito.pdfIn PDF document text
    • http://gugezebaz.mygamesonline.org/american_english_file_1_download.pdfIn PDF document text
    • http://sexesex.site/pulepuzelsy3z5.pdfIn PDF document text
    • https://cdn.sqhk.co/saxezekobida/zjfEDjg/empires_puzzles_epic_match_3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/ia0DjbR/buwowimafuvuxuxumo.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/nibewedebasug.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/Fid3hgD/libizukomejejogusozejasan.pdfIn PDF document text
    • http://azalea.store/university_of_miami_bookstore_coral_gables_flq3dsp.pdfIn PDF document text
    • https://cdn.sqhk.co/kanonilabepi/sAvijgg/kleptocats_2_space_station_purple_ribbon.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/giijjgw/royal_air_force_germany_since_1945.pdfIn PDF document text
    • https://cdn.sqhk.co/kemomonil/cQ7ijha/11887334299.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/ordinal_numbers_worksheets_3rd_grade.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/50726100147.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/bigger_leaner_stronger_mike_matthews.pdfIn PDF document text
    • https://cdn.sqhk.co/tilomulobet/Rheyii0/the_diplomat_monrovia_california.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/YieggeO/vutare.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/18950055876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruvemad.myartsonline.com/destination_b2_key.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/67625357326.pdfIn PDF document text
    • http://nuboguvulasof.rf.gd/71839171907.pdfIn PDF document text
    • http://lugaderova.epizy.com/periodic_table_with_atomic_mass_and_valency.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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 5568 bytes
SHA-256: ad7c5e4c85168d7f0c95c2b83b575d305a2d6fc6ae8be13ef9053fa137823777
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 11844 bytes
SHA-256: 040503902dedb3fc8ce0dedca8ad47fed8bdfa80d0078766dc33603038e700f1

Open this report in the interactive analyzer, or submit your own file for analysis.