Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9a2898399b3774…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 20:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a1a075f2b2044be15cf2edc15585e4d SHA-1: b8c15d7a86126e51248c97e7c16db9122723efd1 SHA-256: 8a9a2898399b3774fc31b079d4d4a31694de6fc1bf04b8f554b6522cd0f33766
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The embedded URL 'https://pelibifir.ru/strik?utm_term=transformational+leadership+style+disadvantages' suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=transformational+leadership+style+disadvantages
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fd06717a37bd.pdf
    • https://static.s123-cdn-static.com/uploads/4475194/normal_5fe195fba135a.pdf
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/8796727ffcd516.pdf
    • https://cdn-cms.f-static.net/uploads/4485828/normal_60342bb9d8526.pdf
    • http://dapumad.iblogger.org/brief_publicitario_de_apple.pdf
    • https://kezeminitiwo.weebly.com/uploads/1/3/4/4/134476020/bifimokazulusav-mulekikajaguxib-repoz.pdf
    • https://nesiwebe.weebly.com/uploads/1/3/5/3/135399888/zuzimesivikogakukev.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/rugawofeg.pdf
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/5792418.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/368bf762-3eaf-496c-a1f9-20211f9b2aef/desuw.pdf
    • https://uploads.strikinglycdn.com/files/d66804f3-a725-4531-bc3b-494dd453c347/72025124006.pdf
    • https://uploads.strikinglycdn.com/files/fc8c48d9-3f46-4086-bb24-568b95d59840/kuruwomawekovev.pdf
    • https://uploads.strikinglycdn.com/files/d3b29cff-cc04-430d-a4cc-2b34a14ff29d/how_to_do_a_journal_article_analysis.pdf
    • https://uploads.strikinglycdn.com/files/a07f8b6f-a7fc-427d-9a87-02f477e2a7fb/triton_atmosphere_thickness.pdf
    • http://suregemebibu.rf.gd/ultramarine_pigments_ltd_research_report.pdf
    • https://uploads.strikinglycdn.com/files/97db35d8-65d0-41c0-8b42-86db1a66fcd2/olivetti_lettera_32_price.pdf
    • http://lixanixuzuki.rf.gd/57899875243.pdf
    • https://uploads.strikinglycdn.com/files/fbe681ba-53a6-4795-898b-5bcca086014c/gelofasobixaxogoga.pdf
    • 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_off0000f925.bin
3afaed11736f978c9fd838075815571571f3c08f050e54d543f815dfabe9e740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 5568 bytes
font_01_sfnt_off00010bf6.bin
77a401271f87c6db1f120dc01b2e8005b61f626c4e6d420d395ae686a098d7e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 10144 bytes

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