Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3f0a5f961057ba…

MALICIOUS

PDF

65.7 KB Created: 2021-03-21 05:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9696fcdeba280cc569b372167b2d35da SHA-1: 978091425c5a61835ba6e7f0da38d475d7a9d41e SHA-256: 3f3f0a5f961057bab1f7614e436bde0e1fa6f0dca5233fca44b3422b2bbd0134
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or to redirect users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous unknown reputation URLs supports the phishing and malicious redirection hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=phineas+and+ferb+magic+carpet+ride+part+1
    • http://sokegex.mywebcommunity.org/machine_learning_jobs_salary_in_canada.pdf
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/jezokewokanisogajiku.pdf
    • http://tofotibuwul.sportsontheweb.net/40388268677.pdf
    • https://jurijibo.weebly.com/uploads/1/3/0/8/130874645/4753303.pdf
    • https://cdn.sqhk.co/lewovazu/hhjKq3Z/wales_v_scotland_world_cup_qualifying_1986.pdf
    • http://rejawulomov.mywebcommunity.org/knowledge_based_error_example.pdf
    • https://cdn.sqhk.co/pilozarager/hcjcgdn/giwetidupewonetu.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/9401260.pdf
    • http://medilawibume.scienceontheweb.net/poem_analysis_example.pdf
    • http://fakurivevid.scienceontheweb.net/bivunutavorawonesudi.pdf
    • https://bativajo.weebly.com/uploads/1/3/4/6/134662657/00ccf65532d8c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeroguru/heard_em_say_piano_sheet.pdf
    • http://tidovaj.epizy.com/gularisutozefiwepisezaxo.pdf
    • https://s3.amazonaws.com/ruzaganog/dajarokejusezaki.pdf
    • https://s3.amazonaws.com/zatazewoz/pdf_books_free_medical.pdf
    • http://notaruk.rf.gd/papilewujexekesig.pdf
    • https://uploads.strikinglycdn.com/files/232c14be-ffbe-440a-b70f-3ae94cb40023/dead_wake_book_club_questions.pdf
    • https://s3.amazonaws.com/leributafa/infinitive_and_gerund_worksheet.pdf
    • http://komupidije.epizy.com/how_to_practice_emotional_first_aid_ted_talk.pdf
    • https://uploads.strikinglycdn.com/files/05a2bc5f-47ad-431e-b530-32deda28763e/what_is_ansi_standards.pdf
    • https://uploads.strikinglycdn.com/files/ae229a04-9a24-49d6-9a09-9af7c5afefb2/ejemplos_de_artes_plsticas_para_nios.pdf
    • https://s3.amazonaws.com/badodemebo/36143211057.pdf
    • https://uploads.strikinglycdn.com/files/cdeba32c-cba2-48a4-b173-95594df3b9b6/82923415884.pdf
    • https://uploads.strikinglycdn.com/files/557ff9e0-1755-444f-8845-8a9f326a5bb0/telupu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d2.bin
7fe9a764b6751c62aa00fc97662b5c0adf03d81b85f61dc9d88eeeb2b046bb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 5732 bytes
font_01_sfnt_off0000d52f.bin
083919bf3937ef2f9aa056eee57d149bb97e2da9a56c8ec8e88a66b608e6645e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 10312 bytes

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