Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c45e710b08c7fe…

MALICIOUS

PDF

78.6 KB Created: 2021-05-04 17:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c9d9523a5c3089e5fcbf24930b6c35e1 SHA-1: e92dd4c5186522c9dddc622fe733df5cc641654c SHA-256: f2c45e710b08c7fe20e558ec3d46f8147aec368db38c70adeeb752600d6702df
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. The presence of URLs like https://nipisod.ru/strik?utm_term=western+snow+plow+dealers+duluth+mn and http://najijojovigom.myartsonline.com/autodesk_revit_architecture_2020_essentials_download.pdf supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=western+snow+plow+dealers+duluth+mn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454426/normal_5ff0157c268f4.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/house_building_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_606c63ed2f4aa.pdfIn PDF document text
    • http://card2card.live/635421111244i79r.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/how_to_calculate_the_magnetic_field_in_a_coiljmee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473419/normal_60078c9889e5e.pdfIn PDF document text
    • http://bezprovodov.guru/lopi_wood_stove_insert_double_dooryi09s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najijojovigom.myartsonline.com/autodesk_revit_architecture_2020_essentials_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ecfe76-15d5-4d44-9ccd-ff75288be42f/nemim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af527d6-29c7-4d17-bfdb-1c7efb21ca5c/58942837560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3804aa8-457a-4d95-b945-421a1ee1fc25/into_the_wild_jon_krakauer_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d88453-197e-4f76-9401-2781663e81f2/whats_the_difference_between_gopro_4_black_and_silver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff7a0bd-4335-4ddf-ae1a-e8f4e4bbc9e8/11528503019.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_b2f7b74d35434b0d8316bcab4c716e8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76203e41-64bc-4ff8-822e-e5921ad3f687/69835954032.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_2a5e9cb0299a40748860e088216f8b70.pdf?index=trueIn PDF document text
    • http://negumigimewote.onlinewebshop.net/dreamweaver_tutorial_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546d6460-19b6-4ee3-b253-248f7a9ab96e/how_do_i_clean_my_technivorm_moccamaster.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_30a35126380548b591499c5a15b7bb0e.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_bb8c51c6402a4c27aafbc56a56c56bbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f186b4-658e-4deb-8d3e-49a8b51e4cfc/m_audio_axiom_air_25_manual.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_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 5304 bytes
SHA-256: 9fa9aeb19979ba57704217b0369b8e722660d88baa115e1e17ceae11d99b81a5
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 11452 bytes
SHA-256: 9f4df29ac3f63d09210082a78782886fc62291766cf532e0398769b9b8b02d8f