Malicious PDF — malware analysis report

Static analysis result for SHA-256 4022da7ccf9b3e14…

MALICIOUS

PDF

85.6 KB Created: 2021-03-27 19:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f39a0a0f4c0bf6a092f3035ba83f938e SHA-1: 9927419dbb09cf298b32235cb76af6d8a2ea8e67 SHA-256: 4022da7ccf9b3e14911a587e28ff55a493ef229b6269fa21f32214b4f62f26cd
126 Risk Score

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 0.9995

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/123?utm_term=bleacher+report+app+down PDF link annotation
    • http://badoxik.scienceontheweb.net/lefipipuninur.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/oppositional_defiant_disorder_treatment_techniques.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/7606210777.pdfIn PDF document text
    • http://waliduv.mypressonline.com/lusomifapitabido.pdfIn PDF document text
    • http://losewunisa.22web.org/vocabulary_workshop_level_d_unit_5_synonyms_answers.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/structure_of_fatty_acids.pdfIn PDF document text
    • http://bupimobim.sportsontheweb.net/best_day_of_my_life_essay.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/job_description_business_development_manager.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/scientific_research_paper_example.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/what_was_abraham_lincolns_early_life_like.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/63974000857.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/free_online_medical_books_download.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/90804563111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovolefewawex.atwebpages.com/aristotle_poetics_bangla.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/52674152611.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_1ba53d5bb50046ae81838fa7d77a0747.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_1c978c728e894063a47d3f4da98a31bb.pdf?index=trueIn PDF document text
    • http://renubinivudeti.epizy.com/5e_druid_guide_dream.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_2c959b3c287744b18543d500e7dffd12.pdf?index=trueIn PDF document text
    • http://tasopawak.rf.gd/how_to_play_ukulele_for_beginners_chords.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_10c526e35b8a4266af9ec1e90358e8b2.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_c102e96eaea44df1a37d091e0d6aafb3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 5124 bytes
SHA-256: ae030f3d0ebf174fb11f8e40fabeb25abcc75af568800cedb1f986598034eab8
font_01_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 11460 bytes
SHA-256: 73e66cb17550640d59a280b3cd35fdd4b0048cc1ea633feca8547df5ae221851

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