Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e05f79649e2286…

MALICIOUS

PDF

76.6 KB Created: 2020-12-14 23:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9f86fbfaf13587ac86eca1e4f71d8484 SHA-1: 3d42f1a7a692aa356097c5eacc302080572dca67 SHA-256: 83e05f79649e228674215088bf807f9091fb908f905043c91e0b0be031493f25
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'cctraff.ru'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/123?utm_term=doctor+buenos+d%25C3%25ADas.+no+tiene+usted+muy+%25281%2529 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5fc61d9388846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5fa3745d87cb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfd6e2c6d96458361c2338/t/5fc26ac83485235c8614f242/1606576841812/korg_krome_88_weight.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0c00bc819f1cf49fdd82/1606290433709/24432352182.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c2c46609fd0ee7aa328a/t/5fccf30074a40730fb9a6569/1607267073142/zoxusutoseretide.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/dilobiwuduw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53b22bf71053ccb2c19db/t/5fd2302bb0f0f842d7b0b827/1607610418742/forma_adventure_motorcycle_boots_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/basic_biochemistry_books.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/5585711653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f2abf3-39da-49c6-a40f-df955328d1aa/wujezudu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce05ca49d01c20c203bce2/t/5fcfe304ec1c613cf6c5e553/1607459588947/fun_words_that_start_with_the_letter_s.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/gowitawuzemibupurevajuzak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e1af91-f935-41d0-a7d6-0bfa1f82a3f4/sopolasazuzoxufugowik.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/18508160463.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/chartered_accountant_letterhead_format.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_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 5584 bytes
SHA-256: afadc415c4e779397fb416d6dc5b783be389cbfe3856808fb7bf740f7ee00c68
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 11088 bytes
SHA-256: c4b893cd8ab2b92be8425f2aa5f0e01790b06fce82e0cc9445bf703fa76ac04d

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