Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c56c8536b907555…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 07:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9a0aeaa9ddcd74e751297e5b2e0597b SHA-1: 6a4763a0b23cf715aad6b131f4193c409babd4ec SHA-256: 5c56c8536b907555c4c000c28d1be513e4684457d537a147b4e85a31a250f26c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent link pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the classification as a malicious document designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=website+development+plan+template+excel PDF link annotation
    • http://jutovutivori.22web.org/50053386351.pdfIn PDF document text
    • http://lefejot.22web.org/car_coloring_sheets_printable.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/29225379047.pdfIn PDF document text
    • http://rezonansmusic.com/pevelafoziwilewgc7rj.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/jogefalukuf.pdfIn PDF document text
    • https://cdn.sqhk.co/bodegife/flKjexZ/happy_fall_images.pdfIn PDF document text
    • http://limons.space/clicker_heroes_clanto8mt.pdfIn PDF document text
    • http://reduslim-officialsite.site/505811968855v2j.pdfIn PDF document text
    • http://llloooodddd.space/makalah_ahmadiyahdjmw1.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/fiidzK0/woodturning_lathe_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fexuror/sunikozatimoli.pdfIn PDF document text
    • http://vaxavepado.rf.gd/90284290162.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f9cd9677bffe420680074555b76d1219.pdf?index=trueIn PDF document text
    • http://levigorofelo.rf.gd/microsoft_office_access_2020_bangla_tutorial_free_download.pdfIn PDF document text
    • http://kagijido.myartsonline.com/91902445276.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/performance_appraisal_process_hrm.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/semi_centrifugal_clutch.pdfIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_b98c6a81ce4b46beaec1c92c7121c56e.pdf?index=trueIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_bc2d5e8623ed4b43847f61d5ea910e4d.pdf?index=trueIn PDF document text
    • http://xuwizigev.rf.gd/zitapapubomatadamuk.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_fe7c1d2ba8684baf834a81b0894c38bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/victorious_song_freak_the_freak_out.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_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 5404 bytes
SHA-256: 057dca2014f5353601868abfc3df9f2de8181444e06f6ca9e76e6c7d32d24804
font_01_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 10700 bytes
SHA-256: 6ff0d5675bfe2419af7c46628a2b66e1f294f8b05223ebfae275270e48309a1e

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