Malicious PDF — malware analysis report

Static analysis result for SHA-256 304edb4b0b81b526…

MALICIOUS

PDF

120.4 KB Created: 2021-03-28 10:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 444819e61a2edbbcb82849f46ef50584 SHA-1: 5a28cbe01a6d53efc27b6b1c57a40be54bd14e8c SHA-256: 304edb4b0b81b52630a465ba9bd1e041772b16415e35c67b13b4d504d7ff74f0
126 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to direct users to potentially harmful content or for SEO manipulation. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious distribution or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=tenzo+r+wheels+weight PDF link annotation
    • https://cdn.sqhk.co/zosikoto/8o59Uid/cantaloupe_island_bass_line.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/fivojoj.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/puzutudali.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ibjgjjM/10007829415.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/eqGKhfu/starlink_battle_for_atlas_xbox_one_unboxing.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/cijhjkn/30607959163.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/WIicxY8/yahoo_mail_organized_email_itunes.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/YjcAhjC/orange_tree_imports_coupons.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/perenatisuvev.pdfIn PDF document text
    • https://pokuzasovud.weebly.com/uploads/1/3/4/1/134108684/fixozovaxiwaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/nhicX8o/diy_world_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/jhS9JDG/57350644375.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/7825960.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/6208134.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/nurut_gugeduvaxaf_betuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/bjbijii/tomcat_windows_service_java_heap_space.pdfIn PDF document text
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/1570485.pdfIn PDF document text
    • https://jiviwakabukowe.weebly.com/uploads/1/3/4/0/134096071/zujodegoja.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/fobupojowojon/25133673880.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_aaf8a98c9d5046f5b5224b136c11a375.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/befofofafara.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/genotakujasalo.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_9929fa96448f49cfa7d423d7fd3249b5.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_f2a37c5f18d14705964325fb3d002641.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_d636b715206947b28fa7af2500d388da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/28441504167.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/aa_unlock_apk_root_not_available.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_off0001996f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1996F 4828 bytes
SHA-256: 16e9aba02e1ec640a4b304a60e00e2d3f04d862473717149f89bd2b15f4d6e3c
font_01_sfnt_off0001a9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9F0 12272 bytes
SHA-256: e11606e9d53b7f9a063bc93413602285b4c9b8f04fcbff28b9c8ae91163cbd4f