Malicious PDF — malware analysis report

Static analysis result for SHA-256 052feb2945a25f9b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 08:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 21a96e00909625b79954e3cb3048a45e SHA-1: 5b95707c707d38c8aca4e502d00881d805c98170 SHA-256: 052feb2945a25f9bde7b3d693e3c447438e74a6e6233935e6d93bceb5cc326cc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though heavily obfuscated, are indicative of a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=grade+2+math+subtraction+worksheets+pdf PDF link annotation
    • http://niburufajanuto.sportsontheweb.net/how_to_pair_lg_sound_bar_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_6058e778070c5.pdfIn PDF document text
    • http://medtechnika1.ru/81970481035rybfu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_602a1dd7545c8.pdfIn PDF document text
    • http://busivel.xyz/yorkshire_bike_race_2019_route9ucxe.pdfIn PDF document text
    • http://fimewot.xyz/behavioral_neuroscience_textbooknhohs.pdfIn PDF document text
    • http://vehicleinsusa.com/how_to_restart_scansnapo17e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_6056b7028b5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_600d0411e72bd.pdfIn PDF document text
    • http://palamuduto.iblogger.org/bosesiba.pdfIn PDF document text
    • http://sodaapp.pro/88663786302xda8t.pdfIn PDF document text
    • http://trylait.pro/pogamikizmeswk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368251/normal_5fcedd7e98ee8.pdfIn PDF document text
    • http://francobusiness.com/buralafuji87x3l.pdfIn PDF document text
    • http://my-favshopf.online/zatekoturuvajejanuga0hzj8.pdfIn PDF document text
    • http://ygrash.website/2436953770859va4.pdfIn PDF document text
    • http://prizinsta.site/jilakevumivexowaxubivobyo8i.pdfIn PDF document text
    • http://meetly.space/excel_increment_sheet_numberj4isc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bituxezemas.epizy.com/red_capsicum_nutritional_information.pdfIn PDF document text
    • http://tejogasev.rf.gd/bioenergetics_lowen.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/65843328830.pdfIn PDF document text
    • http://wodasakuzetu.rf.gd/physical_science_final_exam_study_guide.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/boccia_rules.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/clases_sociales_de_la_edad_media.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_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 5820 bytes
SHA-256: d183b13b25072ef6cd32a7ba7b2a2b3fd9b82b0d8a88ee4a2faa9ea6a0b019c8
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10548 bytes
SHA-256: d117af217520b8d5c8790a2551cf14741d1f81814fa80a635b017e5e6fae45c6

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