Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75395768ad33513…

MALICIOUS

PDF

75.7 KB Created: 2021-03-15 22:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 730ae1d6d3364ec8ab0acf1ac4c3251d SHA-1: ae53afcf5520198cf34d3c14c688dc9496417186 SHA-256: f75395768ad33513fcf1ba5b10a91eb7a7eaf6fc67cd191cc2fee66d1648188e
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous external URIs, with a primary one pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's part of a link farm designed to obscure the final malicious destination.

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://kuzutuzo.ru/wix?keyword=blade+and+soul+leveling+guide PDF link annotation
    • http://xeberul.mywebcommunity.org/745506073.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/facial_diagnosis_of_cell_salt_deficiencies_a_users_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_603040b3151ae.pdfIn PDF document text
    • http://gbo.guru/xixuzasasojumojita2ia7m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_604c995c5a008.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/85010203217.pdfIn PDF document text
    • http://zoo-taxi.site/top_5_international_news_todayk6cqs.pdfIn PDF document text
    • http://vehicleusains.com/drinkwell_platinum_replacement_parts2996p.pdfIn PDF document text
    • http://libralab.digital/how_many_episode_will_that_time_i_got_reincarnated_as_a_slime_haveoduk0.pdfIn PDF document text
    • http://raisinshub.pro/89382055027fnaew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_602ee1ed1987e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382192/normal_5ff605607e836.pdfIn PDF document text
    • http://centerverifybadge.com/gigajokow315sz.pdfIn PDF document text
    • http://imm-shoes2.club/lucky_block_minecraft_command_1._1477088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe46d96-cc0e-4aac-9cee-f41689fbe6cf/37555098672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea1bdcd-ff38-4c91-b826-00413c7180ed/maytag_bravos_xl_washer_drain_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767ceaac-4c00-41cd-9540-40d9ec16d020/wavufarowumizofakubib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb89d2f-f9ce-4b21-a1ba-6d1c3fa0c341/degubuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6933ae61-4d02-4695-b6a5-280cd029ddce/81625559836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3614e5-7316-440a-b76d-d81f12c6380a/sujetorifetanidim.pdfIn PDF document text
    • http://dugerem.atwebpages.com/gunoriponebobumanuzoveful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f4e418-37b8-46b3-910b-5f12dd40e6d5/mens_huffy_bikes_at_walmart.pdfIn PDF document text
    • http://girofili.myartsonline.com/how_to_connect_samsung_xpress_m2070w_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd77f30d-9369-4ee9-b6e1-981a6c208983/14613424500.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_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 5008 bytes
SHA-256: 3149800a04493bc43fb29ed29099c56f92c17e30de71cd67f92349441d51f9ec
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10524 bytes
SHA-256: 9fc2e1da90604e6845e2f9bef95a6fed585b975dbf2d6f2b2e011ae969a09de8

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