Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc871495f4fda65f…

MALICIOUS

PDF

68.0 KB Created: 2020-11-10 02:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a4b43503c9891e96116d874fe03a5860 SHA-1: 9654ffea512a9ed7b21bcb3486c862fb49383a00 SHA-256: dc871495f4fda65ffcf7bf65180c762501da9ed56c3f57489385c6c5b6c16e06
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?keyword=cook+s+corner+spaghetti+night In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f9cb74f0caf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fa9c5d91422f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5f88fdc891966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f9091e935244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f9cda61c4ffc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baba34c-dd5f-4738-92b0-614732981f14/lajofawopidusewoxom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca03f58a-c805-498e-9cb0-bfb127d73a8f/67830550496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aec8890-5129-4d0b-9bf9-732d4a4d2e61/jasegamawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbf5bb2-958f-4183-b884-ddb488e7ce15/26324853705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5aecf36-eb90-4213-a18a-6cd8631b603a/transom_window_sizes_12_x_66.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/kingo_root_superuser_apk.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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 5132 bytes
SHA-256: 057cbeb5988b03b6b8ab9ba60044dedbf640e8cb3a6e2027ff5eaf50c1c25a7e
font_01_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 12360 bytes
SHA-256: 1135fc58c4c1d0897df21654efb3a292445268dec4cd7e15e11ff3b6be665923

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