Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b3190d3e5bd845…

MALICIOUS

PDF

65.9 KB Created: 2021-01-12 16:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4d58105b5b91a11e01c6b31ec8f32cc4 SHA-1: 79c82ea16091c8768a79a56b16b2044a6def7888 SHA-256: c3b3190d3e5bd8459ba4c848161e4318f3b1e131ea25c26118d0f609555738e5
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which are to potentially malicious or spam-related domains. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=domains+of+composite+functions+worksheet PDF link annotation
    • https://site-1175399.mozfiles.com/files/1175399/busulabi.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/dijinsT/huey_lewis_wife.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/Jichgjf/numovuk.pdfIn PDF document text
    • https://site-1210587.mozfiles.com/files/1210587/the_master_of_knife_chapter_105.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/ysrHhd7/11606758672.pdfIn PDF document text
    • https://cdn.sqhk.co/puranajav/dgijeV0/misirumag.pdfIn PDF document text
    • https://rosiwefoves.weebly.com/uploads/1/3/4/0/134018148/acfc6f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/YlYgB3N/sifemabojuzerigevujuxor.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/takurugilij/converter_to_word_small.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/86205708485.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/kristine_chan_deloitte.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/viseteju.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/irene_adler_theme_violin_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/kavisebebijixu.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/98549565873.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_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 5380 bytes
SHA-256: baa3305ad981916746452272b48132f7594c2be49c791c664f445d0d5aabb9d2
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 10196 bytes
SHA-256: 471513fb12e25779b3c335d9b89b716d56536b5ee81c116c5dbdc09e313262bc

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