Malicious PDF — malware analysis report

Static analysis result for SHA-256 638663ff1da5f0fa…

MALICIOUS

PDF

81.6 KB Created: 2021-03-18 01:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f7ccc0343b896555ede70a8a5e9d6984 SHA-1: 6c708ff5e268b389a7cb4ead25ab3142e1d8b476 SHA-256: 638663ff1da5f0fa446854f1de522151fd767c0edcc489379705ca8bc3bff085
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, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=what+are+some+prompts+to+write+about PDF link annotation
    • https://cdn.sqhk.co/luzeginu/xgc49ib/classic_rock_us_radio_stations.pdfIn PDF document text
    • https://cdn.sqhk.co/talulofofexa/fgiJNQL/truck_driving_jobs_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/hb6LI9m/44758639684.pdfIn PDF document text
    • http://saratov.ooo/46485535825wajt6.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/Z093bhi/extreme_motorcycle_riding.pdfIn PDF document text
    • http://evilcheats.fun/19342670473pyox5.pdfIn PDF document text
    • http://sidawiw.iblogger.org/tivazogefifu.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/dSsZohb/madaripovifuzimefok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekurenu.rf.gd/98308889648.pdfIn PDF document text
    • http://zofewodugap.rf.gd/star_trek_william_shatner_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e557c6b3-de8f-4b70-9500-ce1afcee5f89/oster_food_processor_blade_not_spinning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea3f380-05eb-41e4-bfda-7a060a1909cf/piwuxokabepedelofut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222e490f-484f-465a-826e-b6869def7749/how_many_words_does_the_average_24_month_old_know.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_c037816bc5d046aab77065b4e8edac33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e9ce20-d02a-4677-b829-4724cff6b206/openoffice_formula_editor.pdfIn PDF document text
    • http://vitimalu.rf.gd/fun_anger_management_activities_for_youth.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/bulleh_shah_kalam_in_punjabi.pdfIn PDF document text
    • http://bajawawuriz.epizy.com/razet.pdfIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_0e673bb478ac487c92365a7660046f9a.pdf?index=trueIn PDF document text
    • http://bexadujozopu.epizy.com/72810783832.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_b6b384d4c9534875a85ede199c508793.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_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 5272 bytes
SHA-256: e584f723061c4a9e07f0d07611badf93c32136e27f9adcb8fdff9a7202309b5d
font_01_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 10864 bytes
SHA-256: f40f91b5fe2600310bc635ba372c8d23b3aca71b8c2d80608f502c1c876d7b3f

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