Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4070a7de3a924b7…

MALICIOUS

PDF

83.2 KB Created: 2021-03-14 13:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e944ebcdbac32cd0ed12f91154237fe1 SHA-1: 27fc49c9987f9e75822c71f963b53b2b17890bad SHA-256: f4070a7de3a924b7ba0ac43a3c9053076517684db21b409f562261b0c07e2692
186 Risk Score

Malware Insights

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

This PDF document 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jacksth.ru/123?utm_term=captain+america+2011+movie++in+tamil PDF link annotation
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/nimizobeto.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/navinape_rabososagogesu.pdfIn PDF document text
    • http://kotexob.iblogger.org/cateye_adventure_bike_computer_manual.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/biology_grade_7.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/sindrome_de_arteria_cerebral_posterior.pdfIn PDF document text
    • https://cdn.sqhk.co/negixakozaxu/icqhajd/34624191058.pdfIn PDF document text
    • http://chunyoo.com/ic_7805_voltage_regulatorwaoyd.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/what_does_32_bit_system_means.pdfIn PDF document text
    • http://jumbochecker.com/xuwutitamijanewovut7r6xy.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/29258089058.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/hbsrOhj/creating_word_doc_template_indesign.pdfIn PDF document text
    • http://hurricane1.space/the_fabric_of_the_cosmos_the_illusion_of_time_-_documentarywn1w8.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/ojeDMhf/18487281041.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/Yhiijjb/25094570097.pdfIn PDF document text
    • https://kenivefu.weebly.com/uploads/1/3/4/7/134715486/6759638.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/terilumodumerilavuwaga.pdfIn PDF document text
    • http://formverifiedbadge.com/spiritual_meaning_of_angel_609r3584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_00e513fb3bbe456798f90db5521242b6.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_7e2d36f6dc32422aa25990ae3c42b0a0.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_03c2e064df034086bff7c37efe873c8a.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_1441b0b8eb00454f95151959e34585e7.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_f1c8294ea59047e297d2ba0fb93bf836.pdf?index=trueIn PDF document text
    • http://zumoriko.epizy.com/how_much_does_samsung_a10e_cost.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 5100 bytes
SHA-256: 420d8071234bb4065485741eefdc082684c98cef8af2f834281c76f25579305d
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 4144 bytes
SHA-256: 04726ecabd77f06f42ac96031f1b2b3d342313fe5348ae5165721680cef4985f
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 11888 bytes
SHA-256: b127747a644d700ab03a8397a04d3e7936a9d0a165869d575dda8143326b2c24
font_03_sfnt_off00013094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13094 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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