Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28718a4d71c583c…

MALICIOUS

PDF

77.0 KB Created: 2021-04-11 02:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 91c302fe8cb0252dc8e1142530818a2b SHA-1: 55a455b808af6a02062c35da4bd91aa3d8753ffb SHA-256: a28718a4d71c583c8fc9b5f5ba55413c27eec15f746917513c1f729110ff346d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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 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://druttle.ru/strik?utm_term=library+lion+read+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5ffa2bf78bf85.pdfIn PDF document text
    • https://riwaduzubef.weebly.com/uploads/1/3/4/3/134319835/9944418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_606d29983d473.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/52245039467.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/wutegegiju-gipujuxovevafa-gixuvekuveponiz-ximifupumove.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/riwukuk.pdfIn PDF document text
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/xababen-vezovaj-kovumunip.pdfIn PDF document text
    • http://gepizufejilubis.iblogger.org/25764506602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fdf7837937a3.pdfIn PDF document text
    • https://dakuxemi.weebly.com/uploads/1/3/4/8/134883968/wajuvekupezogaxam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopozuputerud.rf.gd/landscape_architecture_books.pdfIn PDF document text
    • http://pepukogabam.rf.gd/552478321.pdfIn PDF document text
    • http://wipidomi.rf.gd/reading_comprehension_practice_worksheets_6th_grade.pdfIn PDF document text
    • http://wulitebajanuba.rf.gd/3rd_grade_reading_books_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1edbc42-0548-4c04-9c3f-aca6c090b11b/kosasaxolo.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/how_to_reheat_frozen_maggianos_lasagna.pdfIn PDF document text
    • http://guxajez.rf.gd/banking_system_project_report.pdfIn PDF document text
    • http://jirikefo.epizy.com/polycom_vvx_410_handset.pdfIn PDF document text
    • http://dovobol.epizy.com/wuninamerevumuwew.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/83525635872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d685709-5628-4a31-ad53-4de0e9d4b0e9/81749678287.pdfIn PDF document text
    • http://jofejibare.epizy.com/behaviorism_vs_mentalism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cacaa69-485d-4a60-bb52-1e3ed87bb1b4/jobapom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32191dc-6069-47fc-bb1d-dcbfcb458bf5/40971780756.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/auld_lang_syne_sheet_music_flute.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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 4824 bytes
SHA-256: 30757d1a61d0c24521bc32984d1df110e20ef16cd6bac726070713e4b126429c
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10620 bytes
SHA-256: a4d9e29a382f9a7e6cf920ae8efe191f0a973d3126780a521740a4527b763a1e

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