Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a9fe405688b387…

MALICIOUS

PDF

78.8 KB Created: 2021-02-07 02:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 83b0f54c2b0d4169174d488bfd1cf00f SHA-1: 1d8bd348ea43508cd23afa166239f3f880c08157 SHA-256: 65a9fe405688b3872828fb3f60012021b7502aa352088bb134de6c4735ad12dc
186 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary external URIs, https://baarspo.ru/123, is likely part of a phishing or malicious redirection scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/123?utm_term=the+%2528mis%2529behavior+of+markets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ffebfc4d1bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd2fb7216335.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/fb3383cd4015b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379606/normal_6003e36ac064a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450898/normal_5fffe76e139aa.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/tijarewowejubuj.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/1e2e43e8d.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/7e646a9.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/f623637a2a.pdfIn PDF document text
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/muretalebetafu.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/vobexadiso.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/betefowubevat/apex_legends_size_reddit.pdfIn PDF document text
    • http://nemabufebuxabo.epizy.com/formation_mba_audencia.pdfIn PDF document text
    • http://menufuvaso.rf.gd/tm_apostol_calculus_volume_2.pdfIn PDF document text
    • http://tozopovudot.epizy.com/christmas_phonics_worksheets_second_grade.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_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 5616 bytes
SHA-256: e68d507634841d0a48ef19e66237da96afee909bff43383cb853e24056689d9d
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11224 bytes
SHA-256: aa503f61a40130e7943405118e2f21f7c53a81da546f4f969ce3c14b7bcbd8fe

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