Malicious PDF — malware analysis report

Static analysis result for SHA-256 b616e1c81f2b311f…

MALICIOUS

PDF

78.6 KB Created: 2021-04-25 00:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2d0c5e9be3b4ddf9b593633560b40a5f SHA-1: 51610077197e933f3e0324dddcf3f1fbc7dcf7ec SHA-256: b616e1c81f2b311f287b4d011d9115a4094cb35672222b0d7267f2141abe70d8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The primary external URI, https://mezovuduw.ru/strik, is likely used to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful sites.

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
  • 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://mezovuduw.ru/strik?utm_term=should+you+do+glute+activation+before+workout PDF link annotation
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/jojilofapu.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/g5Chhha/bovuvifezipitifi.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/8heieG5/muslim_family_day_care_near_me.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/fusuzom_powujixagewi_daveda_zopodukodovukit.pdfIn PDF document text
    • https://kajivuzixoji.weebly.com/uploads/1/3/4/3/134332867/59cb20.pdfIn PDF document text
    • http://bemixenorekuji.22web.org/spreadsheet_excel_online.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/jcojbij/65578809078.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/1636938.pdfIn PDF document text
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/liridefutebi_vevup.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/phhhdqz/xomapanapanimotogefesa.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/jakujakula/36065335710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8840e1-726d-444c-b15f-80d2884b5c5d/18581510102.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/63213637985.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/furutexa.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/jiroputiduzamotepusiguk.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/46376054621.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/divisibility_worksheets_grade_7.pdfIn PDF document text
    • http://nifiloxoburufi.rf.gd/masejasejobedoni.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/sc_dmv_blythewood_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4c7621-534d-41b2-a434-d72f18f74c4a/how_to_apply_oracal_651_to_cartridge.pdfIn PDF document text
    • http://welurolakis.epizy.com/carpophilus_hemipterus.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/dia_de_los_muertos_pumpkin_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/caller_tune_song_free_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/benchmade_knife_guided_field_sharpener.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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 5664 bytes
SHA-256: 4d18a79080da561e0e370b5247cae96c05d2f44aa0af2c6a6c3bd03059193bb8
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10468 bytes
SHA-256: abb00d691c66f05039fd5ebf1a81bdc018b8c19925c71c4fc946d0ef684c37c1