Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe6b432e6ba6bcc…

MALICIOUS

PDF

70.3 KB Created: 2021-02-17 09:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9bc75b9a3d2222e7e832029a83e01727 SHA-1: b08dcc92d2f0d93d6bf10ffa38e471cd8424bd7b SHA-256: 7fe6b432e6ba6bccc951ca5e2d3dd1ad7712ed6f26717dcce57d7feee3b243fb
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to 'https://yafferge.ru/wix?keyword=cascadia+tech+academy+programs' as a malicious redirector. Another heuristic indicates a PDF link farm, suggesting an attempt to artificially inflate search engine rankings or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/wix?keyword=cascadia+tech+academy+programs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_601a5425ada06.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/6408996.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/nuvijemaduvulo_wutuzu.pdfIn PDF document text
    • http://getveran.site/dosewukatisizasikidisebqqwyf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472486/normal_5fdf5e51e07f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_600b72bfb975f.pdfIn PDF document text
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/5655354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fd91f1c09f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_601273ea77b50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_60050fe6b9cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_60259cc550f2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe8aadd7b5d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_60036cb4bb845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dabatisew/amnesty_international_activism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/33512965312.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/assamese_old_bihu_songs_website.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/revezemufirizi.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/dalio_economic_principles.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/78286557063.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/year_3_maths_worksheets_australia.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_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 5460 bytes
SHA-256: aa04a3a796a9ff124aba0f10a1a8febf31893875fecd4a05e61a3be32881188d
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 9928 bytes
SHA-256: f871ffb41d0f75dbbab1dcee1b12f7f7bf6ff8a253c25a5b04539568bf0913fd