Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefc8d0318a02960…

MALICIOUS

PDF

67.1 KB Created: 2020-11-10 22:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 12c428f5481bb6ae84650764e7b06bfb SHA-1: 90b8768b5dd94e0f812f14ce05f1160857549063 SHA-256: cefc8d0318a0296001b36fe5d624b19e33f5f758f31056171ef082e2155becf4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution attempt. The embedded links, particularly the one to 'traffmen.ru', point to known malicious redirector infrastructure, suggesting the document's primary purpose is to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through deceptive content, likely as a spearphishing attachment.

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?keyword=character+types+worksheet+1+answer+key In PDF document text
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/vapezakojani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5f8d4a71b1c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_5faaf1bba439b.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/8725396.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/lazubawavupiwonusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fa62a9b63dc0.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/9333405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_5f930492dbaa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f8fe01d50c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5f9f2ebaa3db6.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/pibajuwi/73043508212.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/pisuzalune.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/69536178925.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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 5204 bytes
SHA-256: 2bc9aa133198ca1341503ead7feffc3d8aaafb8a17855c698e003542eb8b84bb
font_01_sfnt_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 11768 bytes
SHA-256: a4d8865f8118aa581b1ce7c8369029324ab19d8a29f8ff03b713eb54fc64a5c7

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