Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b9d3c53cccb79b…

MALICIOUS

PDF

89.5 KB Created: 2021-04-02 07:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc70412d1255f2b6bd342e3b206ce643 SHA-1: 73de9942c7643388d17c7b806300516a3b201a61 SHA-256: c9b9d3c53cccb79b016c44120b02b3bcc5c9f4d2fa54da9614d60ffd7433711e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://xajibur.ru/aws?utm_term=ejemplos+de+dialogo+para+resolver+conflictos PDF link annotation
    • http://wonizojaru.scienceontheweb.net/facebook_blueprint_exam_study_guide.pdfIn PDF document text
    • https://zomijozefabeten.weebly.com/uploads/1/3/4/6/134636393/jarupemupe_momukimibof.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/jujopiluderadulezukusoza.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/povapugizalut.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/harry_potter_trivia_quiz_sporcle.pdfIn PDF document text
    • http://funewiwawako.iblogger.org/electrical_technician_interview_questions_and_answers.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/f344f185b.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/c307e5148bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_e6c2851854814b349d135443235af9ae.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_ecc8632359da49b59abb883be01b0307.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_7de2ec5ae7de4906b0087a8f4d1bb713.pdf?index=trueIn PDF document text
    • http://wupafar.rf.gd/what_is_your_faith_and_strength_quotes.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_a4dcfc9adbd647abb9b5e4e66f50ea92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/mimejimelaxitivaxola.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/tilumigopijebi.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/answer_key_for_10th_maths_book_2019.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_77efb7f68f1d4c6188326938e16175e0.pdf?index=trueIn PDF document text
    • http://zudupaxub.myartsonline.com/differentiate_between_gdp_and_national_income.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/kuxafurorameg.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_3a02cf9202b24560ba647833e5ee6abf.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_afe704e1c3eb4b7e9248945fa63cdcf5.pdf?index=trueIn PDF document text
    • http://megutid.epizy.com/million_dollar_habits_stellan_moreira_free_download.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_8a5165c107a8443aa0c5f3909efb2ac2.pdf?index=trueIn PDF document text
    • http://fefemegazo.rf.gd/how_to_get_disney_now_on_apple_tv_3rd_generation.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_e475e9ea8dff4b0fa4d90d4d4b7333a8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 5568 bytes
SHA-256: cc8b1f948a012787afdc8a8b8eb459b7a6404a5b4d59f030265746461569cb2a
font_01_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 12080 bytes
SHA-256: 71d3fe436e0cb0d88a72c2f8db8da78563f6aa0bbe13dd4ae80cd18891048bda
font_02_sfnt_off00014035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14035 16204 bytes
SHA-256: 83b0f3ed90e545d6d36d14a1982d3fe7024877db6cf476e622725167f7eecf28

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