Malicious PDF — malware analysis report

Static analysis result for SHA-256 22497d26728a7c6b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-15 01:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03d99f029657c742af1f5d430c2e020b SHA-1: 8f4d4908fce5dfff82983e72285b654501a44403 SHA-256: 22497d26728a7c6bc470a7191c1309dab1f808c6e856439d16b6818e61aaf46e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of multiple external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=first+grade+math+addition+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/jirowolad/ajaSjdZ/equalizer_apo_not_working_windows_7.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/bamimuvaxogejet.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/09896d380.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/jadubasopogijolidep.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/G7Oicij/kika_edgar_que_bello.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/e139c3e79cf.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/idmhfB5/game_guardian_no_root_free.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/8839d543ed2c09.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/kDjiSid/bimiwevu.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/b4456abd-3723-4930-9992-985fe6d00b44/book_buffet_project_cake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ee746d-d160-4d10-981b-09623ea8efeb/fesigopilozaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/mirawatun.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/klipsch_promedia_2.1_bluetooth_speaker_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f77757-7780-4e37-8234-ac70376ad871/electromagnetic_field_theory_and_transmission_lines_gsn_raju_download.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/router_setup_page_apk_open.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/lawowimukixuvozerujadidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf46cfb-46b2-4fc2-bb0e-7e19067c2033/how_to_negotiate_a_lease_buyout.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/39108811664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd55a4d5-3073-44a7-b6da-fcab04179f0f/60934141724.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_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 5532 bytes
SHA-256: 9ca5196544010c1d13ed6b73649db523959eab59687087c8595f4e290cced5ca
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10648 bytes
SHA-256: 864013a0d70f092996b47ba73335ef405e69180400086133e48279cd1b2d7867

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