Malicious PDF — malware analysis report

Static analysis result for SHA-256 c678e7293e3b9050…

MALICIOUS

PDF

80.8 KB Created: 2021-04-07 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: feebfcf3374fb6c3c3ae5f72cb81de47 SHA-1: d56be42b9287c5a807699a6a46425f48bb1db104 SHA-256: c678e7293e3b9050a0fdea88d1086023ddcb75dfd55d979fb3b6e7af64964ef9
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://zajinet.ru/123?utm_term=developmental+biology+book+pdf+free PDF link annotation
    • http://worldthailand.fun/537926608277zwod.pdfIn PDF document text
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/4282578.pdfIn PDF document text
    • http://gufutaca3.xyz/shadow_of_night_chapter_summary8knv7.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/2171791.pdfIn PDF document text
    • http://jelabenix.22web.org/kannada_latest_love_feeling_songs_free.pdfIn PDF document text
    • http://musapexumuk.22web.org/python_interview_questions_and_answers_for_experienced_download.pdfIn PDF document text
    • http://myvenza.ru/guidelines_helicobacter_pylori_eradication_2014yr9o0.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/jiwasupamizuxe-xadirofuxan-xadasenaze-bumesi.pdfIn PDF document text
    • http://kupuzuzopojesu.22web.org/27344997612.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/logo_game_answers_expert_pack_123uhw0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/pagiwotojonato.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/conocimiento_cientifico_de_la_metodologia_dela_investigacion.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/consecutive_dates_in_excel_sheets.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_4af96e9573ea49aa8684cdfa8bea0793.pdf?index=trueIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_c7eb5d762fc5493e9206815190f23776.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_bbf10f63ec10434785744eb112bd6c4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/drill_press_guide_for_hand_drill.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_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 5548 bytes
SHA-256: 5fe793355d190e8ff7b2fcee93a5454504272b089d00b4495613cfcc86781fdc
font_01_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 11172 bytes
SHA-256: 7c1f71aa3ae7bb1d5692c9be4fbdaa9425f5a9c806acd49ff55d46dcd30a651b

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