Malicious PDF — malware analysis report

Static analysis result for SHA-256 78792a8fd3dfd68f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-18 17:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b24221cfa48733d46bbbe822e810a6d4 SHA-1: 5b2f7915c1dae1d852fa7b907c3dc02118c65378 SHA-256: 78792a8fd3dfd68f179b7266c2117831b92b301b4bbc64668f879cfe44d1f649
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to 'Smile dental book online', likely a pretext to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/wix?keyword=smile+dental+book+online PDF link annotation
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/bf8a68.pdfIn PDF document text
    • http://xowozumevabig.66ghz.com/ixl_answers_8th_grade_math_z._11.pdfIn PDF document text
    • http://amst-watch-v2.club/201784n30.pdfIn PDF document text
    • http://alisabor.design/audacity_free_onlineh5v1w.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/sunedagosogu-nazijarolalosig-vikipaponubeveg.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/8940312.pdfIn PDF document text
    • http://merovew.xyz/genetic_mutations_in_humansmgp2y.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/activator_for_ms_office_2016_freebwcfk.pdfIn PDF document text
    • https://rizimajapalikum.weebly.com/uploads/1/3/4/6/134633575/suninusifimojuz_zumugobax_gujowot.pdfIn PDF document text
    • http://gitamoravazini.22web.org/basic_geometry_worksheets_grade_7.pdfIn PDF document text
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/92b6a796614.pdfIn PDF document text
    • http://idealica-ufficiale.site/buwewamjxj6t.pdfIn PDF document text
    • https://mutapeninudit.weebly.com/uploads/1/3/2/7/132712174/967b59b9.pdfIn PDF document text
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/lasexit.pdfIn PDF document text
    • https://nuxikete.weebly.com/uploads/1/3/3/9/133997556/famuvirebopeketaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_3c6f6769928044e8a78a45f1c00bc0f1.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_88134ebd8d6344fdb53a6320f0ec1869.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efaeb2a-48fa-4672-9101-ef0ea283e761/who_is_the_most_popular_kpop_girl_group_in_the_philippines.pdfIn PDF document text
    • http://pikigefunix.epizy.com/camila_cabello_havana_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdbb15c-157b-488f-91f0-31c8f3731014/diduregutanijolivu.pdfIn PDF document text
    • http://dizogusuvi.rf.gd/34823672738.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_323962277f4f4e0ba6a170500fb27d79.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_1e3859ab4b944e46a24887ca9f82d02f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e52a4a-da48-4649-990a-d16406b1df43/sevavutepoxalezatupipiti.pdfIn PDF document text
    • http://volozixoxogibe.rf.gd/george_foreman_smokeless_grill_ratings.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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 5004 bytes
SHA-256: dd8fd57949c90c7d7c552c4580ce674166182ecbc7d5e0862a332fa0660ee815
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 12204 bytes
SHA-256: 8e41e284ef706aff3c73da1b9d0baa699fffda5f67324485613181cb3383013a