Malicious PDF — malware analysis report

Static analysis result for SHA-256 746e4b7af3cd4a83…

MALICIOUS

PDF

66.1 KB Created: 2020-11-14 20:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7cc6124b61c26d8b8ac0c664d649e925 SHA-1: d16019f8d7ff7dcd3b51f52b8ae9da4a33823277 SHA-256: 746e4b7af3cd4a839d347d23abb5254f01815c10818e3c4e3618c4ce8741f235
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with one pointing to 'trafftec.ru', suggesting a potential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=buchholz+relay+in+hermetically+sealed+transformer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f973fcd6b4e3.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/konabewil-fesagu.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/libusamagowuvo/kakesakemaxadib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c913e1-ca06-4e6a-99da-2164963aa7e6/widewogasiwajapidetem.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/excel_formulas_vlookup_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/sutim.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/86321770556.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/13507380229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6513bbd-f738-4359-9a1d-47d113e88b39/xuwipokevanuripubukegobe.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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 5460 bytes
SHA-256: d6b86b36b1fa70ed01590072c1770898c88ac53c7e9d80e2ae0c519214e376e5
font_01_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 10772 bytes
SHA-256: 9d3bc6fc89a940fb70ebff968f1f9eeedc6da1ef2641fb5762fc7cde3fc3092f

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