Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f27428f3f25cb5…

MALICIOUS

PDF

80.4 KB Created: 2021-03-20 01:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 34fdb4b9a33f235a319369707ab7322f SHA-1: 097209ac24608648c0c205c947d06522c9eb795d SHA-256: e4f27428f3f25cb5b69d8b4581493610eda7820cd63319c34c4d4a6fd2b4f97f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a malicious payload. The document body, though heavily obfuscated, suggests a lure related to graduate school interviews.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=graduate+school+interview+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/golemejexeno/jfifKhf/ruxawajawuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/JDOichf/98357085129.pdfIn PDF document text
    • http://filanion.online/ranma_1_2_live_action_pelicula_completa_espaol6ajs3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_603b7c831d9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fd34efa36723.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/Agjhf1n/pewotemidugolo.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/hf3jbja/trap_adventure_1_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/dijYieV/the_chinese_university_of_hong_kong_postal_code.pdfIn PDF document text
    • http://flowerport.market/hunchback_of_notre_dame_2_songsetix4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd001f1e1f.pdfIn PDF document text
    • http://topcabinets.xyz/ff7_strategy_guide_booksfs79.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/RLfajbz/96499572742.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/ABOGhjf/midok.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/idiahb6/rikim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480412/normal_6004eb01f0991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee693481-db03-4b25-aa8a-b682fe7885ac/casio_2747_aw-80.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9932e95f-823d-4230-a647-0684ff3f70e2/nordyne_gas_furnace_heat_exchanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a9c861-87c9-4e50-b8ea-63348b74c1f8/what_demon_is_in_astas_grimoire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e43f060b-3fc4-4b0b-8f53-07bad938c958/miniature_dachshund_blue_eyes_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1173cc7-6251-4ece-8c55-02307ee9fb62/60416438911.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_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 5336 bytes
SHA-256: dd746e5ec2fac552901f265ddd108793769a6ec3d22285ee339ffdfde465c149
font_01_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 10756 bytes
SHA-256: 6cf0bafa0edb46898da038573e5a9570f8bca4618d267920518f02976e2ff03d

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