Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7cd66cf66f7490…

MALICIOUS

PDF

69.3 KB Created: 2021-03-09 08:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 831b2a6e7ef22531b6b95173315363cd SHA-1: c92e5a6c71da18d9be86e52ac6553bff0e9274f5 SHA-256: 7c7cd66cf66f74903da1a91e0f1cfc5665b8cb16a141ab91cc8a3591fd30b8a2
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/award?keyword=oxford+english+for+cambridge+primary+4+pdf In PDF document text
    • https://cdn.sqhk.co/tuzevawu/hijigfV/44037020831.pdfIn PDF document text
    • https://cdn.sqhk.co/dupabeket/ahdjhjd/mawegikasixepafux.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/zhgk0jj/93913312779.pdfIn PDF document text
    • https://cdn.sqhk.co/wavafinudow/fgfCjdh/cv_template_for_pharmacist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_601952bb5ebd6.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/hbgixp4/music_download_paradise_mp3_pro_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391623/normal_6001296ebc005.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/8hbghYg/96886736179.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/ajgOm78/giant._io_pc_version.pdfIn PDF document text
    • https://cdn.sqhk.co/wezikinupig/hUYhhjx/72891603006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_4a77556283bb4cbe89dc9166e1749e34.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_fa5ee6f75909479b80c24e386eb0fae3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/63356985290.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_54bf0e6417d14a10becc4862ed363aed.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_943dca433f344f25abe3b37628c0e9c7.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_4cfb3df55bec4459804173ba39275cef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/bizesubelune.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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 5992 bytes
SHA-256: b2a71358858312ffcd7cfcdb995b589496c2ad1635fe55fb82ad7e0b1fea6f35
font_01_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 9848 bytes
SHA-256: a031c0ecded828087138fd1f80ff0576cf9ff2dd3075ac129fedd0e19d671859

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