Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d21d2cf6759dd9b…

MALICIOUS

PDF

80.5 KB Created: 2021-03-26 10:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d41493ed9781a2d01f530473c616afe SHA-1: d01fe9b2424ae2203878632a16d5f4617ba43abc SHA-256: 4d21d2cf6759dd9bb4f3184edd535914f3b7852b7e76704b35b541ab70af0e7b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting a tactic to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=branded+tv+series+theme+song+lyrics
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://xteenware.online/thesis_statement_practice_worksheet_answer_keyz8dbt.pdf
    • http://cenderaoriginator.com/georgia_drivers_test_appointmentm2zmh.pdf
    • http://cashbackk.site/counter_terror_apk_modo1v4b.pdf
    • http://nekazupafo.mygamesonline.org/33737024089.pdf
    • http://marifivelaj.mygamesonline.org/kevufidumupimu.pdf
    • http://gijaninapumobe.sportsontheweb.net/55507116648.pdf
    • http://gepexoliv.medianewsonline.com/82107898308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_1caa58da30dc4dad8e9760f208197d9b.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_cce0f91651604c869dafa687bfa16a00.pdf?index=true
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_ec583abf1fc34f1586e00f2e7b120347.pdf?index=true
    • https://s3.amazonaws.com/vifusupegiza/cidco_lottery_result_kharghar_ews.pdf
    • http://paguxesij.myartsonline.com/bill_nye_energy_answer_key.pdf
    • http://jopubijako.atwebpages.com/cozi_tv_schedule_tonight_columbo.pdf
    • https://s3.amazonaws.com/pezofut/autodesk_2015_xforce_keygen.pdf
    • https://s3.amazonaws.com/zepifudoxapo/mogozusemakidosakixib.pdf
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_99f796ffdbc94417bb985e546db97de9.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/backyard_burger_nutrition_guide.pdf
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_7a991b46fa234448ac64eda28b5a7007.pdf?index=true
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_3cc889e53da445ffb7f934b2d573c0b8.pdf?index=true
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_e906a8327a51478e97ae3c63b2f97a10.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/aggiornamento_android_pie_huawei_p10.pdf
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_a1eefe57035f4731819b5af129a1c583.pdf?index=true
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_5e51c31df4da4fde9f6ced049a564494.pdf?index=true
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_45c9396351d946a4add91f20c6def148.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa69.bin
2bb5fcb6de63160a47eabc1cb9e726bc7ab524f58ecaaebdecf2718bed01b692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 5564 bytes
font_01_sfnt_off00010d3c.bin
a20307432dd005c8edacbcfb2d267c58288ebcdfed0e5c25225aed9227a45129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 11328 bytes

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