Malicious PDF — malware analysis report

Static analysis result for SHA-256 2137c0a824f1e21f…

MALICIOUS

PDF

87.5 KB Created: 2021-04-23 21:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 11e0aa4b82a39a39c835e492db595bb1 SHA-1: ddcd524810bde905199f4ef9ebb975b5cdca45ac SHA-256: 2137c0a824f1e21ff2ac5f696e04153f4bf45e1bc18c3676f8945bc9c7248e9d
186 Risk Score

Malware Insights

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

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 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://bologen.ru/strik?utm_term=tipos+de+sistemas+operativos+servidor PDF link annotation
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/6755dc.pdfIn PDF document text
    • http://kernig.online/meweb7rh5h.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/ujeijij/black_coffin_nails_medium_length.pdfIn PDF document text
    • http://usesalon.xyz/oxford_advanced_dictionary_8th_edition_freedy98t.pdfIn PDF document text
    • http://getchambre.xyz/marketing_entry_level_jobs_nycd0njj.pdfIn PDF document text
    • http://genusadnlo.space/how_to_reset_a_slingbox_500lodat.pdfIn PDF document text
    • http://slimerecipe.org/82908770878fb9pm.pdfIn PDF document text
    • http://devgm.design/msi_970_gaming_killer_network_driver66sk3.pdfIn PDF document text
    • http://raifaisentgo.online/should_i_use_a_dehumidifier_in_my_basementa7pot.pdfIn PDF document text
    • http://idealica-ufficiale.site/aws_platform_as_a_service_offeringskri5f.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/kagodidoganono.pdfIn PDF document text
    • http://instapriz365.online/dogibamewiwagarugebizr5x5.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ePjhdib/hitman_3_release_date_xbox_one.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/8d3e1d8573.pdfIn PDF document text
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/xafusexoxuvox-rukule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_64c852c0923b43ba91146488cd403d42.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_1e3d618e937648408d6b173d9fd0d259.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_d9d63ff433f64d67b48fe95bde60e896.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/najuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/why_do_systems_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/86851325084.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_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 5080 bytes
SHA-256: 1e26a0145acb8fb01a5ca67a162652b9a3650629762a76b4e3e3c8b57a6ba0e7
font_01_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 12496 bytes
SHA-256: 9a4cc4483d507104c2d27de664f41d3691b27733221394c874e464190f676ab0

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