Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec09e5c60420b5ae…

MALICIOUS

PDF

84.8 KB Created: 2021-05-21 18:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 13e5cb4628785b88ddf9b3b7b3296690 SHA-1: 3083073516a015cc4065e97445b3a5f85c0004a6 SHA-256: ec09e5c60420b5ae2c254bb9fe7543066b2cb8494c7d83bb8305d1665531187f
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily corrupted, appears to be an attempt to disguise the malicious content as academic material, likely to facilitate spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://fokemale.ru/strik?utm_term=a%25C3%25B6f+sosyal+bilimlerde+ara%25C5%259Ft%25C4%25B1rma+y%25C3%25B6ntemleri+final+sorular%25C4%25B1 PDF link annotation
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/pujodovega.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/pagotov.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/gebepapapefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_606b9fb6ad54a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_60344797352a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_606b5760a8b6b.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/a526ebaa.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/8588642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fff3a2e3cc3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5fc96be5a20b6.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/29aacb34-e32f-43ef-92b2-3de49611c4aa/what_does_p2_mean_on_canon_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/android_10_samsung_s10e.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/keynote_advanced_student_s_book_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/how_to_clear_bluetooth_memory_on_pioneer_avh-270bt.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/peavey_classic_50_212_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af05c477-5279-45fa-96c4-19bb8bcd7e40/dari_alexander_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/autocad_drawing_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a610b5-59e7-44f2-b864-bf16ca108d4d/what_does_a_and_b_represent_in_van_der_waals.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bootstrap_template_simple_admin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728e4605-d812-48cf-915a-12dfac665d49/club_car_onward_lifted_4_passenger_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecf3dff-3451-4833-9b92-23c14540a95a/11492102794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a953b76a-7df5-4b0f-aa22-4da4519267c0/what_does_artistry_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f9bfbf-9438-43e7-a666-e845ee91193f/wizard_of_oz_musical_script.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/sezenaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdea5df7-15a7-45cb-87c6-041f5f2bc023/woratozobisefubarisenu.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/why_my_lg_dual_inverter_ac_is_not_cooling.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_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 5704 bytes
SHA-256: ca5a26122297993607bf84601eda09c32cad72fd76c16f843dac947e802db740
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 14124 bytes
SHA-256: 1c09c8bc12364ef7745895573b44d1d987e780564d481d4efc9243a42d99cf7e

Open this report in the interactive analyzer, or submit your own file for analysis.