Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fe5c00a045e1e7…

MALICIOUS

PDF

82.4 KB Created: 2021-04-01 13:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9416a1d4f609b6315ee7e9ac41596415 SHA-1: c7d7e21906c401eabe7aaed9a7ca00670cc3ead4 SHA-256: 53fe5c00a045e1e7c98941120588c8dc5cda574516ea39175cb22b83b886bc4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://jumiwimov.ru/wix?keyword=century+21+accounting+authentic+threads+answers PDF link annotation
    • http://promoocaoameericanas.com/birdland_weather_report_analysisxiowb.pdfIn PDF document text
    • http://yewes.space/95068943u1zhm.pdfIn PDF document text
    • http://rollernefrit.xyz/xutalinemrirqz.pdfIn PDF document text
    • http://hookup666.site/fexewekawepovu7xemt.pdfIn PDF document text
    • http://slimerecipe.org/chandamama_kathalu_telugu_online_reading7qrmx.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/293804b039811.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/vakarovelolid-lewene-didiv.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/genukopapovixo/how_old_are_the_shining_twins_now.pdfIn PDF document text
    • http://kerepokomodas.epizy.com/vector_calculus_textbook.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_7837267a98fc440eb304d6428bae6915.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/attendance_sheet_excel_template.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_f04c39a4b4544a25afac05026c0d78ae.pdf?index=trueIn PDF document text
    • http://demunoj.epizy.com/19107474230.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_0278e8a94d074eb68d4adeac25eec7a5.pdf?index=trueIn PDF document text
    • http://rizibapuzaduxe.epizy.com/black_demon_slayer_guide_osrs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/how_to_connect_bluetooth_to_sony_wx-gt90bt.pdfIn PDF document text
    • http://jamigiboweb.rf.gd/bupagorom.pdfIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_4082e08ee90d499188f7ce667065a17c.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_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 5452 bytes
SHA-256: 558284e9c4abbfcb5441d065f69438c04e37defe188fea080e7871e2ef82fcbc
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 11436 bytes
SHA-256: c0ed162846c2383ee8b3f4f69deada7b9b48dd50d34ffd0eb160ed3102504f32

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