Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7ca401474346a3…

MALICIOUS

PDF

97.0 KB Created: 2021-03-04 09:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9cff5337701e499f2b9fab527604928c SHA-1: 1acd11524627b8b601498dcb699d0578f6cb8e1f SHA-256: 4e7ca401474346a3fb4a0cf1d27d641923726d1f3edbc591f5ac72aad89b505f
186 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely intent to redirect users to potentially harmful sites.

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://jottigo.ru/award?keyword=what+is+the+function+of+law+in+our+society PDF link annotation
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/bupokikutovobi.pdfIn PDF document text
    • https://bexavulurezil.weebly.com/uploads/1/3/0/7/130738929/c420fe5ce04b36.pdfIn PDF document text
    • https://ditexoka.weebly.com/uploads/1/3/5/3/135398742/32f19cff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_5fe3facddedde.pdfIn PDF document text
    • https://sasofotomedulel.weebly.com/uploads/1/3/4/2/134235056/4f838c22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5ff24eec0cce1.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/465654.pdfIn PDF document text
    • https://cdn.sqhk.co/lewatesudo/bgfhUez/74479527182.pdfIn PDF document text
    • https://cdn.sqhk.co/dameseri/wQibbie/giwik.pdfIn PDF document text
    • http://alania365.ru/download_cura_profiles_makergear12a85.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/pokusel.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/wikawomalinerisud.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/320653.pdfIn PDF document text
    • https://cdn.sqhk.co/pexufenek/eibgeid/pokemon_cafe_mix.pdfIn PDF document text
    • https://porilijure.weebly.com/uploads/1/3/1/6/131606314/3d53db4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebusatoro.atwebpages.com/scag_turf_tiger_35_hp_vanguard_oil_change.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_off000141df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DF 5176 bytes
SHA-256: 79fb9ab3b31ee2a697cee168f31fb3c4261f367dc94fe666ce2ef2b56f1f430d
font_01_sfnt_off00015395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15395 10160 bytes
SHA-256: 579ef34f9fd608cfe1bb423f5a428cb80580df4dfb74b4c24c76e5d8a78473da

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