Malicious PDF — malware analysis report

Static analysis result for SHA-256 f878cd22a74ad329…

MALICIOUS

PDF

76.9 KB Created: 2021-02-22 19:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 39f9805cc446cf2784874c8a7c875d46 SHA-1: 9b627b3aebd6b5105a1829b102f4782db63d78b3 SHA-256: f878cd22a74ad329a5ab3a9c18e30e89f4b0c7e1f4b373ac08de7c74bfa53c00
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it is part of a link farm designed to direct users to various websites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous URLs, including those on disposable hosting, supports this assessment. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=shark+navigator+lift-away+upright+vacuum+uv650+manual PDF link annotation
    • https://cdn.sqhk.co/tisewesir/haGheEd/43443246665.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/Hxpggjd/commuter_benefits_nyc_login.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/do_the_navy_reserves_pay_for_college.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/42956894296.pdfIn PDF document text
    • http://bowojimiwa.22web.org/xazopimibedafuvaparukoku.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/wakivedinivi.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/gsd3gjo/ocoee_weather_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/1vJ7bav/hangouts_application_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefazox/jj3NUCK/city_story_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/jM92icZ/snowflake_meaning_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/UUggp4F/lufopuxovadibimo.pdfIn PDF document text
    • http://jimubezisu.iblogger.org/6874116864.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/jbhvwwj/narcos_cartel_wars_mod_apk_1._37._02.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/pCXNoje/real_camper_van_driving_simulator_beach_resort_truck.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/Xciggdi/thermo_king_ballymena.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/SegcJVP/daily_class_schedule_template.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/e2321684ac4dbe5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakogajoxe.epizy.com/79255956495.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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 6124 bytes
SHA-256: add83199055248701d69452945d803bece4088d56e848208f4624735a299aa56
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 10444 bytes
SHA-256: 1ce59fbe9e6b8e96c3787e2f8be8dd9f8310103f22c046fe1c64a78ca196f126

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