Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c4b30cbd5a9071…

MALICIOUS

PDF

74.6 KB Created: 2021-03-30 05:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eea62eb336d7e7f81c08409aab9493b7 SHA-1: 1a565372c252311739a503eca703bd9e5ffa4bf8 SHA-256: b7c4b30cbd5a9071c207093f7acaaed32cf74f202a301a03be3721aec9e36927
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting services, suggesting an attempt to distribute or redirect to malicious content. The PDF structure itself does not contain executable scripts, but the extensive use of external links is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=nj+trail+series PDF link annotation
    • https://vibajadulefunuk.weebly.com/uploads/1/3/0/8/130874079/boruk-gopobeloxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fe835bca1e43.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/152bbabb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_6024610be5ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_6035bd71c2bdd.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/supize-tuzegobipafew-jodetakasemi-kumiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417418/normal_5fe254f559882.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/bidot-vosezumifa-setagowaw-wanalujotixo.pdfIn PDF document text
    • http://shopwithsale.website/pejepasidue327b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_5fe9d2707ea87.pdfIn PDF document text
    • http://gakujimogudap.22web.org/best_private_vpn_browser_for_android.pdfIn PDF document text
    • http://smartroom.pro/what_are_the_types_of_descriptive_writingftv9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_60622d34585c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimetogobosibim.rf.gd/whirlpool_edr2rxd1_refrigerator_water_filter_filter2_3-pack.pdfIn PDF document text
    • http://bolapapuziku.epizy.com/joxexoweso.pdfIn PDF document text
    • http://lesuzikabe.epizy.com/nodale.pdfIn PDF document text
    • http://difiravopaju.epizy.com/adjectives_worksheet_4th_grade.pdfIn PDF document text
    • http://kifobidurusidi.epizy.com/all_saints_national_academy_ofsted_report.pdfIn PDF document text
    • http://timidomefiwow.epizy.com/40157628361.pdfIn PDF document text
    • http://vezavajizuvos.epizy.com/feasibility_report_samples.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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 4724 bytes
SHA-256: 51dc0c910256929cc8b530c5fe672fe69d8c07048655f2a242c57179308d9cc9
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 12092 bytes
SHA-256: b362dd9cce1e4018fa37b7ba0f35c15e63084d5a382c7e8580ddce8d987e58b2

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