Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde7339f17182a85…

MALICIOUS

PDF

78.5 KB Created: 2021-06-10 14:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cd8f731e679525d23ea28df89335ba95 SHA-1: 33af0902badb51761ff4d753fef1fb2ef38e3b03 SHA-256: dde7339f17182a85a39829c087d7944776390f64375b1e43c28b4cbea7512909
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://chcial.ru/pbw?utm_term=cycle+racing+game+download PDF link annotation
    • https://kijadixuzot.weebly.com/uploads/1/3/4/5/134585523/golixigomulezev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_60c15253c4ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_6015feab2b944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_60430c20c5540.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/7069419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_6056bca6a385d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fddc7da8b132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_602980b530a1a.pdfIn PDF document text
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/jamoxevet.pdfIn PDF document text
    • https://dorinupunariwuw.weebly.com/uploads/1/3/4/7/134716439/kivilowo_tomokarefis_kegoxuzuk_porukexazakewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_602654ebda788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6041c32854c35.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/c737dcceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_6025fc8c9dda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_6068b700ce4ec.pdfIn PDF document text
    • https://gibinefofagal.weebly.com/uploads/1/3/4/6/134668975/1592047.pdfIn PDF document text
    • https://riginujer.weebly.com/uploads/1/3/2/6/132695799/jisakezaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitizuxob.pbworks.com/f/kopazerivanumugisuleraze.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426570/fnaf_the_fourth_closet_free_download.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/39268173167.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144789981/how_to_pronounce_french_words_for_beginners.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144882057/prepositions_of_place_in_spanish_worksheet.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144553239/does_iron_help_your_bones.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144629811/pichuva_kaththi_tamil_movie_download_tamilyogi.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_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 5180 bytes
SHA-256: 79b86c6243281b4e1287d3238484d5660099b7238974d918f814aac14991e5c7
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 10396 bytes
SHA-256: 45f08cd19d23ee1cf8c3ce6ffafad998d01216c806fb5b847efeaf73fba36825