Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efcff9066401122…

MALICIOUS

PDF

66.5 KB Created: 2020-12-09 00:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 60739d17ff884a6b987e789e0a442536 SHA-1: b94777b91666580e83405026254f297997c745c4 SHA-256: 6efcff9066401122b681452ca8eec9507e70047ec326f32f2bbe658e2da8d7e0
214 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 critical heuristic firings for linking to known malicious redirector infrastructure and containing a large link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=how+to+cite+a+painting+in+text+mla In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5fa615494a070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fafa133eb936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fbc6cb0aaa95.pdfIn PDF document text
    • https://goxemuneb.weebly.com/uploads/1/3/4/7/134715014/jedara_jatotatom_tigaburoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5fa0fb80ce947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fbefceca6403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d2fc00-0a68-4203-a36f-af01e26f1455/351_winchester_st.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/template_of_announcement_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/9883673535.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/exogenous_antioxidants.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/sleep_number_i8_reviews_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/jfk_new_frontier_speech.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd3383f35aa262c26b001b/1606235015916/brevard_school_calendar_2017-18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d975144-bc38-474b-a65d-c87db01bd296/23846282508.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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 5100 bytes
SHA-256: a1e397114873bfb01f3159b26c6325de0bfa1bc8d3f1dc24c3ba91c588a9c969
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 10308 bytes
SHA-256: 4544dd90231dd95751a0207dd333867600832f16995d38af10ab8fb3468af886

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