Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cb49e0dcb81cd5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 18:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aae61fc7d269a30d22c67cee8a25a2fd SHA-1: def9686646bea1c3be245756f4463b9edfbd0b99 SHA-256: 72cb49e0dcb81cd515c378e02489ba769a8fee3f1d3e318a5df74a0985a5cdb6
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 0.9996

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://jottigo.ru/123?utm_term=periodic+table+trends+practice+worksheet PDF link annotation
    • http://rajukilodagoje.mygamesonline.org/business_management_certificate_courses_in_sri_lanka.pdfIn PDF document text
    • http://rutomatuwusu.22web.org/54157480742.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/zigalogogoxurikogogegix.pdfIn PDF document text
    • http://texegevesimiruv.22web.org/stages_of_art_criticism.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/what_does_central_processing_unit_mean_in_computers.pdfIn PDF document text
    • http://digosutinovun.iblogger.org/53293032400.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/namodadi.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/nerajujidemudisarugase.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/aristoteles_organon_espaol.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/how_to_solve_math_question_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/learn_calligraphy_margaret_shepherd_free_download.pdfIn PDF document text
    • http://duvodix.myartsonline.com/can_you_take_the_written_driving_test_online_in_mississippi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0372735-ac98-449c-adad-19f60bf868dc/jukofojew.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_fe7a0c2f223f4ef3a53b998c03237c8e.pdf?index=trueIn PDF document text
    • http://defozuwonig.rf.gd/living_by_the_book_workbook_answers.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_2c8ef4c58eb04f51b0758c6841dc7b5f.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_ce1a2ead81ea48a382a7015f09653b4a.pdf?index=trueIn PDF document text
    • http://muwuvago.atwebpages.com/54712358958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015a5317-fcb1-49c8-a0ea-31993e100ef1/vue_js_referenceerror_require_is_not_defined.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/la_casa_de_bernarda_alba_sparknotes.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/91240643747.pdfIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/xudatipasiridakofogi.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 5456 bytes
SHA-256: 388b9437334dd377eb3463beba8dda994375cee058255f517b2b6392ac0ffe60
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 10788 bytes
SHA-256: f9a8f42bb85f21f7dabd35be1bb19a72c4d218e177dfe025dd452bcb1c94916c

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