Malicious PDF — malware analysis report

Static analysis result for SHA-256 5856130523394668…

MALICIOUS

PDF

67.3 KB Created: 2021-02-09 21:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e3554aa209b7f7df7b2853f43621a550 SHA-1: 0d3b53ffacfebc94db898618e2242419196b9466 SHA-256: 58561305233946689c90dc9717a25f27237d69ab3946d1dfc24cdfd1df3e5da8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is directly related to a 'tax collector appointment', suggesting a social engineering lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=osceola+tax+collector+appointment PDF link annotation
    • http://kprovk.xyz/planetside_2_wiki_vehiclesviugf.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/gFiaANX/72554334014.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/K07hiwi/94563981204.pdfIn PDF document text
    • http://namelesssouth.xyz/alienware_17_r1_service_manualo6jmb.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/0Hhiigi/certified_internal_auditor_syllabus.pdfIn PDF document text
    • http://4gusevshop.space/modelo_de_recibi_wordje0w8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fc7c5fe5e781.pdfIn PDF document text
    • http://servempieza.site/girl_scout_cookies_strain_grow_guidekp5u7.pdfIn PDF document text
    • http://1offpark.xyz/dungeon_defenders_3_release_dateftucb.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/nubozuleloxab_tejubepesi_luwivogusexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_600a8192a973c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_5fd8f658454f3.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/dopugaxelelema/kim_tra_c_o_form_kv.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/work_cited_mla_format_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/3571818462.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/castrol_edge_5w30_data_sheet.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_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 5176 bytes
SHA-256: 8691228538a95ed9e45eb3f16a9de1ed2a5894bfd9290496fa8516743413b0ac
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10556 bytes
SHA-256: ca50970caef95a1e8e72e1ec385817baf795b307f8065edf88eab57133fb8e2d

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