Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce73a9fdb130709c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 21:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6abf80f3f4acf84f14e4939a082c723 SHA-1: 9b1597ad2ba1f42eebe0bcd8ad9d278640c18bd7 SHA-256: ce73a9fdb130709ca10b03a52f830da43638630abb08891144caf6bb5743881f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a large external PDF link farm hosted on disposable domains. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the document's structure and embedded URLs suggest a phishing or SEO manipulation campaign, potentially leading to further malicious content downloads.

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://zajinet.ru/award?keyword=staff+performance+appraisal+form+pdf PDF link annotation
    • http://hookup756.fun/is_gta_v_online_free_on_ps58im5y.pdfIn PDF document text
    • http://argo-tourism.com/717111983112pcc.pdfIn PDF document text
    • http://tramlaweq.online/jotadowevfzfxe.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/demano2rb0m.pdfIn PDF document text
    • http://kimujitotam.22web.org/nofexojepusiw.pdfIn PDF document text
    • http://itanto.space/6167189966534og8.pdfIn PDF document text
    • http://krokoboko3.xyz/how_much_is_30_months_in_jailo13up.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewaditina.epizy.com/acls_pretest_answers_2020.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_4b1d1cdd9d064b20b8ea86a5b779f384.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_89cc457ca08f4de7bf60afbc2274da50.pdf?index=trueIn PDF document text
    • http://zopumukujo.epizy.com/agile_software_development.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_be8821aed5674838b317c8274d50fb39.pdf?index=trueIn PDF document text
    • http://vuzabog.epizy.com/60598019954.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_b7607dc7381b43d0bf548f65a5a1e7a1.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_1c4f2b92961446c8b51bd1b509815155.pdf?index=trueIn PDF document text
    • http://netedokikisij.epizy.com/4806867655.pdfIn PDF document text
    • http://pulilidason.epizy.com/jabimi.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_d4ff7b26182f477ab6796485b9456093.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_063745f8b8c144698c6ca01e855b0e9e.pdf?index=trueIn 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
    • https://archive.acas.org.uk/index.aspx?articleid=1438In 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_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5404 bytes
SHA-256: 61240fcb3bd82fe804e7e8b62d7ef1c9b1bdd30cebeaf291c3798d3db44efd1b
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10824 bytes
SHA-256: e664d6ed0123171116635e0facb21ffe7abd2a5413c034b329cff9788b601c78

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