Malicious PDF — malware analysis report

Static analysis result for SHA-256 2807ce12e969a960…

MALICIOUS

PDF

72.6 KB Created: 2021-02-28 10:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b9318e152656148ca17d4cf13727f669 SHA-1: c6412bff3592d299eb70d8ed8269d66c788a5595 SHA-256: 2807ce12e969a96042b0989a26e116f2ee0d1ece776584417f01bb6f048e0e42
134 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=tom+campbell+my+big+toe+pdf+download PDF link annotation
    • http://gonojokolekovo.22web.org/ascites_in_broilers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5ffb7bd118d3a.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/94437046271.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/how_to_program_vivint_element_thermostat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_601d4e31b9d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_602c348cc3635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6016e4263e444.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/cultivo_de_arroz_en_el_per.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_60339d294c1bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5fe14bd782ca8.pdfIn PDF document text
    • http://jaxotibovafel.iblogger.org/how_to_get_current_currency_rate_in_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://belivadu.rf.gd/creative_resume_templates_psd.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/mojozunoxabaw.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/zorba_the_greek_book_critical_analysis.pdfIn PDF document text
    • http://jovuxajir.rf.gd/najaxoximeremudezemuto.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/advanced_excel_2010_vba_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/89387230457.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/77910021365.pdfIn PDF document text
    • http://likefiradoweze.rf.gd/budixexesukisowavemuwomav.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5484 bytes
SHA-256: a2f4d028d62b4bfe23f98befb2fe84f005c67946a9ff6e1fcf64d9b57036f1be
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10072 bytes
SHA-256: 654efb6f62d150cc59926e52be4a87ec678cbf53540595af3ae99356a435bd63

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