Malicious PDF — malware analysis report

Static analysis result for SHA-256 335bb55170412fb4…

MALICIOUS

PDF

74.8 KB Created: 2021-03-12 19:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 545e3fd75553e6af9921988f7340e86b SHA-1: 1d64f2323ffd8a35ca271ec57848396feec814ea SHA-256: 335bb55170412fb4b882c2a8e625585423bc4058835b99920e3829eb06fda395
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=free+template+resume+design PDF link annotation
    • http://subbellassecret.com/82527212468yo3sp.pdfIn PDF document text
    • http://busivel.xyz/6498248512909h51.pdfIn PDF document text
    • http://pollsexpert.com/how_to_charge_citizen_eco_drive_watchh3cbd.pdfIn PDF document text
    • http://all-casino.xyz/what_is_the_best_27_inch_double_wall_oven1luyc.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/sixth_grade_social_studies_worksheets.pdfIn PDF document text
    • http://nubolats.xyz/49779709595mm1vi.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/lp_anemia_terbaru.pdfIn PDF document text
    • http://sodaapp.pro/what_to_do_if_my_license_expired_during_covid_19wj801.pdfIn PDF document text
    • http://jikonuja.22web.org/bsria_guide_flushing.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/stanley_45_plane_for_sale.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/us_military_dog_training_manualgz9xy.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/59595272468.pdfIn PDF document text
    • http://freud.icu/how_to_calculate_p_value_from_f_statistic_in_rw6pqj.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/descargar_libro_el_juego_de_la_vida_y_como_jugarlo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimadiwiv.rf.gd/how_to_fix_code_11_on_rheem_tankless_water_heater.pdfIn PDF document text
    • http://samupuvigerolo.rf.gd/36187069652.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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 5236 bytes
SHA-256: 2b0f1f3deb1ccacebbe7915bc40091797a8ad19237c39442408e7630ca2f4312
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 11068 bytes
SHA-256: 82683873ab661cbaac6872767894a75d6e5139488dec3ac6eaa57e79c133ceea

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