Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d7afbe650483fb…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 03:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b611e20a80e30be4bd4cb0720e1aae93 SHA-1: 2ac817a813e97c652dcc3eaa0297aa243982bcf9 SHA-256: a3d7afbe650483fbdd6987644942983cdffb883a654a14c6de39e9b7d219fabb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=eraser+hd+movie In PDF document text
    • https://cdn.sqhk.co/wazikunal/jdThhhi/wesajafunukadijudigifun.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/MHhbxje/6013837362.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hmiftJK/table_tennis_bats_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/xeEjfij/woodturning_supplies_ireland.pdfIn PDF document text
    • http://cosmeteca.com/peggle_blast_how_to_get_long_shotsyyrdh.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/bobanibizogik.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/Wie6vhe/skyforce_unite_mod_apk_1._9._1.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/gfnl7Pu/voice_memos_on_iphone_6s_plus.pdfIn PDF document text
    • http://circulyarkadigital.xyz/edexcel_igcse_economics_student_book_answerso1jac.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/ggid7AE/international_nurses_day_2020_nz.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/39821761213.pdfIn PDF document text
    • http://clubstore.pro/gewosajifaditalen7fpoi.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/cu51aie/dayz_lucky_looters_server_discord.pdfIn PDF document text
    • http://opensol.xyz/rotovawutenubunupakodiguxjbfj.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/value_based_education_essay_in_hindi.pdfIn PDF document text
    • http://art-practice.org/skaven_battletome_freew9gbs.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/90ba4afb-5905-4a65-baa4-bfb09f74aabd/jituxiwirosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be98ce7e-f401-4e1b-9d0a-f935487388ef/gopro_hero_4_silver_manual_portugues.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/juvelapuguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbac0b7e-c589-42fa-9e23-1de0c6ec1c79/9143231736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be65c7e1-44aa-4311-b4b0-bd1cfb42927c/which_accent_is_the_best.pdfIn PDF document text
    • http://xiditad.rf.gd/telirufukix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa0cd45-24e9-4923-8883-1abef0b71af9/rasezarekurozesixised.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 5048 bytes
SHA-256: 69779e8b4b6067fc1039e40c79533c9e09be0cf09fef81b6749d4814d256b686
font_02_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 10544 bytes
SHA-256: c98a2fa71e786cbdc95822826cf01a7649a15f7df1265e9c461ef668187d0d13