Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ebc78c6ef9d786…

MALICIOUS

PDF

78.8 KB Created: 2021-02-11 17:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b522d37789344c25ad3e8b782bae7ede SHA-1: 8db0257f8ed5dfedb8272dceaa395d81c0c5b6c1 SHA-256: 00ebc78c6ef9d786cf55294ccecaac24f1be00a0e3eb177e4d68df7f8f0039bc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to a 'tax calculator', aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of numerous links to potentially malicious domains indicates a high likelihood of directing users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=tax+calculator+excel+2019-20 In PDF document text
    • http://jivopifavu.22web.org/bonus_ball_number_sheet.pdfIn PDF document text
    • http://keep-travel.com/impossible_engineering_trainsz0tyv.pdfIn PDF document text
    • http://sidagopuxi.22web.org/96415908202.pdfIn PDF document text
    • http://my-credit.info/vefugomaxugix24ns0.pdfIn PDF document text
    • http://detonic-hypertonie.website/40498256036slbj9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384644/normal_5fcceb88becff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601bac883f277.pdfIn PDF document text
    • http://naturalgood.space/64165120759rq994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fe556e7b2a46.pdfIn PDF document text
    • http://redtea.space/50326307404qppta.pdfIn PDF document text
    • http://asia.kiwi/grid-_template-_rows_repeat_10_1fryg33o.pdfIn PDF document text
    • http://lovechat24.club/workshop_attendance_register_templateiw014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befadiw.rf.gd/ujt_relaxation_oscillator_viva_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/boworijomonezunog.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/97623289408.pdfIn PDF document text
    • http://karelovaluz.epizy.com/administracion_financiera_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/dj_mix_audio_song_free.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_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 5148 bytes
SHA-256: 7f80f71ece23dc5b7abcdbd00c512ae027942bcc901810d6bfee1d3084cdf1b1
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 10760 bytes
SHA-256: 289e471322f1661772a97fea725393ae86bb93ba428d76068c1a763fb17ca8eb

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