Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d458cc82d2a4571…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 09:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1b38c43f4c83f0df963dff80de523519 SHA-1: a66ac6d818ac44d5f76dabefbaf1c00f28309e3c SHA-256: 5d458cc82d2a45716b4a9b7b7922a41452a265c3a1b1197c946b527f129d06fd
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, including one pointing to 'kuzutuzo.ru' which is presented as a battery replacement guide, suggesting a phishing or social engineering lure. The PDF also functions as a link farm, with many distinct hosts and UTM parameters, indicating a broad distribution effort for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=ue+megaboom+battery+replacement+guide PDF link annotation
    • http://padlamadla.site/midibavdhevb.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/YMjbjgg/music_identity_paper.pdfIn PDF document text
    • http://reduslimitalia-official.site/how_to_shrink_file_size_on_mac48x7u.pdfIn PDF document text
    • http://madewithsunshine.com/929580023945zz1d.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/Kic9uje/mickey_mouse_voice_generator_online.pdfIn PDF document text
    • http://show-visitor.xyz/how_to_connect_plantronics_speaker_to_computergxjxu.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/xghhi88/gavugarijagerozakesi.pdfIn PDF document text
    • http://presalle.xyz/the_book_thief_summary_part_5xvbef.pdfIn PDF document text
    • http://com-signto6.xyz/besadabodinisokivanayhvh4.pdfIn PDF document text
    • http://converstarget.ru/sql_queries_for_practicegpjbx.pdfIn PDF document text
    • http://portkamesto.site/5571136876lkjxc.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/jhigjcE/20579854357.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/ijggeih/86147604967.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/jiZijjc/how_to_get_loot_in_tarkov.pdfIn PDF document text
    • http://mmmmmme.space/94779579714b3578.pdfIn PDF document text
    • http://visionnew.xyz/breath_of_fire_2_gba_rom_itaidrzj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/rofifoxetozij.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/basanti_movie_songs_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/jopixusarunotuveza.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/2112969082.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/what_is_the_mandate_of_heaven_and_dynastic_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/96524303902.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/fezoragote.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 5448 bytes
SHA-256: 7fb272e20065159e912c25b349a9f909a2f779fe6f88e73f06e57e7f6f7dbf68
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 10512 bytes
SHA-256: bf022b6fb419dfd0f1a2902f281c94c004155c91345e6ddd84bd0be68a92bbae

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