Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafab08410d62bed…

MALICIOUS

PDF

77.9 KB Created: 2021-04-07 10:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5fa597920138c0a315e58bb8841720e9 SHA-1: ce5ae3611b7f660486a2b22515f456e75d40958e SHA-256: bafab08410d62bed2a591469ce88c2e5304c661d18d477a6735aac1e8d36ff74
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination. The document body, though heavily obfuscated, contains metadata related to search terms, reinforcing the phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/123?utm_term=android+10+battery+drain+pixel+3+xl PDF link annotation
    • http://pilefubasusuz.iblogger.org/comparing_and_contrasting_connectives_worksheet.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/setavene.pdfIn PDF document text
    • http://keepxufi.space/masterbuilt_oil_free_turkey_fryer_instructions79z9b.pdfIn PDF document text
    • https://kijagixizob.weebly.com/uploads/1/3/3/9/133997709/zakabupawim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_603f8b60f3616.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/rugetakibojezedibakilel.pdfIn PDF document text
    • https://fuwudasex.weebly.com/uploads/1/3/1/0/131071129/dibotarasawugi-suzikopo-kofozodo-fugagabo.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/6411a4f29ec7f4.pdfIn PDF document text
    • http://hotita.space/asymptomatic_carotid_stenosis_nice_guidelinesyijwo.pdfIn PDF document text
    • http://virnet77.ru/red_cross_lifeguard_recertification_covid2o664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_604b49dfc9def.pdfIn PDF document text
    • http://polikarmonolit.ru/nutaxz4ou1.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/jupusirono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_606cfc19d157a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxesabefadufu.atwebpages.com/rixorarososafotimewoduzir.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/arya_video_songs_free_telugu.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/biostatistics_lecture_notes_ethiopia.pdfIn PDF document text
    • http://mutiwudixoni.rf.gd/carlyle_06e_compressor_service_manual.pdfIn PDF document text
    • http://niwapixezir.epizy.com/conjugate_gradient_descent.pdfIn PDF document text
    • http://daxajokawutuv.rf.gd/payment_agreement_contract_free.pdfIn PDF document text
    • http://sawexelisam.epizy.com/girapelorunebovepofut.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/browning_date_by_serial_number.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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 5432 bytes
SHA-256: 881d66923ee32deede14f367d45e78d68c181450af9835c972926e21785e302b
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10824 bytes
SHA-256: eb7d661f2d0769ff15c5b4b6658e8c2710e4d869ab5c39e474b7cf6c344de2ed

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