Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43b0aeee8d2ae76…

MALICIOUS

PDF

69.3 KB Created: 2020-11-12 19:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2414bef70bdfabd420ca8808482ad2d0 SHA-1: d254579c4fec4a44c55ddabb4ea6e4ae0396fc6c SHA-256: a43b0aeee8d2ae76b3bece3cdcab70034182f85d6f67a6417bea95664656eadd
156 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 embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=wii+u+error+code+160-2713 PDF link annotation
    • https://fabobabi.weebly.com/uploads/1/3/4/6/134678451/4606758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8f557313f7d.pdfIn PDF document text
    • https://dudezixibuwido.weebly.com/uploads/1/3/4/5/134529197/2245632.pdfIn PDF document text
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/xarukufok_rafido_kejevadege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f8979662b26b.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/c9e57f5a-fe74-4822-b0f4-157b3171921f/55687097769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25ecbc3-1206-4110-aed7-8221908b7817/ielts_speaking_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c547c76-7bc1-4315-83ac-40a5344ee4cc/73939936699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd99de3-da37-48a9-9491-e9ee119da763/56433811597.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/integrated_chinese_level_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4772c71-fe12-4a8c-b43b-3779ac81bc88/posiravarejujivob.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/calculus_and_its_applications_answers.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_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 5284 bytes
SHA-256: 47ca3a33722ae02903c20238a51a9b7cfeaa2d423099b87fecdacfeab5c34d56
font_01_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 12428 bytes
SHA-256: dd79a8e36e3ebd10b53e9ed63189c3e5a9ee9d43ca09d1dbe1cce32465017b66

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