Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ff9c72656bb3c…

MALICIOUS

PDF

67.2 KB Created: 2020-12-03 08:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f4446e3d8d08753194a48666c12375dd SHA-1: 1c565bd0c54076598e0455e7e4d991316a84ddc0 SHA-256: 860ff9c72656bb3c1788187c0c5d85ac8f22a307888c33f787b4fd78bcaf738a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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
  • 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.
  • 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://traffmen.ru/123?utm_term=double+object+pronouns+spanish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5f9a65efd355a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fbe9815b36fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5fbb595d76e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_5f9aaa7d91a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fabcab8e1727.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.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/2da3c664-25db-418c-99b3-c9de3bfbd75f/asus_black_15._6_90nb0652-_m30860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5280417e-c62f-439d-ae02-be60045bc1b8/54715174101.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/sduhsd_math_support_website.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/cheats_para_minecraft_pe_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee489bd-dfb8-47d2-8b34-9d93975d9563/jalupiraripazabamanuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec41da8b-b6f2-4fd9-aad2-7cd332b45758/spanish_worksheets_on_family_members.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a7d57c-84ce-42d0-87bc-0257f02c8bce/71344111124.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_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 5236 bytes
SHA-256: 157ce0a5624a00ac83b1963c0fff91a1c86837694ae5c56c5747e6edb24974fa
font_01_sfnt_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 11300 bytes
SHA-256: 45a4473ef47b3c89547b44e970b00016a932c10994b55446f67cc4c7867faf48

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