Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f268077d70c5cf0…

MALICIOUS

PDF

72.5 KB Created: 2021-03-03 16:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2e1c541638ee1dcdd8fd22c7a69ec85b SHA-1: a97a14f80d89c2877f71263f3f4b7bd4b22fcc9f SHA-256: 9f268077d70c5cf08f8ec0f2e66c63ba3b16be8478b0055500918194c1a0b248
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically crafted to appear as a search result for a printer issue. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware sites.

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://soxebez.ru/123?utm_term=why+is+my+epson+printer+not+printing+green PDF link annotation
    • http://missunik.space/40632115879jbcy3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fe80d0e180d6.pdfIn PDF document text
    • http://setakini.22web.org/197_bus_schedule_nj_transit.pdfIn PDF document text
    • http://cetop.xyz/html_css_class_attributefhzgs.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/83f30c75726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_601625a4ecfb4.pdfIn PDF document text
    • http://opsnatur.fun/xagajesisejed0c1m.pdfIn PDF document text
    • http://nedugitovo.iblogger.org/pipuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_600af0c42b546.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/6126168.pdfIn PDF document text
    • http://herss.space/webcam_video_recorder_free_for_pc00csd.pdfIn PDF document text
    • https://jorobeperepi.weebly.com/uploads/1/3/1/8/131856290/c0046fab580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_603882b8c6c54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_601a7794445e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408594/normal_5feed445740a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betupaxomivokab.epizy.com/kakok.pdfIn PDF document text
    • http://tomikuwabawevup.epizy.com/71207272993.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_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5104 bytes
SHA-256: bcc3a2f48f23be5308838ccdf66cc00059514103ace1fb11e1b3fb88af10648a
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 11280 bytes
SHA-256: a1e5fa1bb0ba8d8e825f95822940cf26292c5081379e0487decea7ce51860511

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