Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cf70a63a03c54f…

MALICIOUS

PDF

133.5 KB Created: 2021-02-27 19:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 178e6d4c24c3e572cc9f96bc8adcdf57 SHA-1: 8439c8483d992332365b2aea6302419d23e56db2 SHA-256: c7cf70a63a03c54f6f99b45bf8f7478ad69ffe856a8d66ab3ba97d75a51a158e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://lozipotod.ru/123?utm_term=organization+behaviour+seminar+topics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421473/normal_5ffa1a15c3d86.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/ae5b2ae85b948.pdfIn PDF document text
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/7690550.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/jefiwefutonofoka.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/88a2b02db29660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf3780b7b52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5fd08e3a1fe2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5ff2854b6a999.pdfIn PDF document text
    • http://biomanua.website/55775944430jy299.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/YgfijZC/e_with_grave_accent_in_outlook.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/gjQibjN/golla_mallamma_piano_band_dj_song_download.pdfIn PDF document text
    • http://jonezuno.22web.org/free_christmas_family_feud_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fdb6fe5d87c9.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/hiqiaP8/ragekagibu.pdfIn PDF document text
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/mevoxamanon-vapuzorunagu-rumibenani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6035b4d134c07.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/vn8gcQV/xilerawagipulosepanarowag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFCA 5592 bytes
SHA-256: de42297789f6ad6fd40e98c634bcac868657647ffe18f3d8d4574dd05c3286b5
font_01_sfnt_off0001e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2AF 10940 bytes
SHA-256: 81176289f2e31c3125eedad134f4d6cdde1f57186eb7eacf7c6e8b70e48eefa3

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