Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9caa8e628b31ab8…

MALICIOUS

PDF

89.0 KB Created: 2020-11-30 08:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5ea0535d2e20f799b7a31dfbfeb9d1ac SHA-1: b53a5389a6b50b4cbcd9d568952f93531a298493 SHA-256: e9caa8e628b31ab892d2b6902b32dc3ef695fbbc9a9161e943c19bcea6e19fd4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external services. One of these links, https://traffine.ru/123?utm_term=sign+of+the+beaver+chapter+1, is flagged as unknown reputation, suggesting a potential malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=sign+of+the+beaver+chapter+1 PDF link annotation
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/af449.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/gubuz_jupevuluxel_wababulozepulov_vivulov.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/tigom-jotazebexet-nugivitufafe.pdfIn PDF document text
    • https://sibiwowimi.weebly.com/uploads/1/3/4/8/134868192/jilazanudujo_xekatuwu_kanevedon.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/3f99039e-9222-4646-a612-e9e465263cf2/luther_burbank_home_and_gardens_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554f0e9d-be54-4fb8-8df8-e4428ded61f8/22898878391.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/96526386795.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/68134341360.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/lupajamudevudelalodazuda.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/m_a_due_diligence_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/sue_s_lewes_fishing_report.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_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 5424 bytes
SHA-256: 91dac5c728c65ec523e62505443c95a54be48f44d12b6bd7b9acd549e64d849a
font_01_sfnt_off000134a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A5 10160 bytes
SHA-256: 4e966103fbc73eecb6f5b02197847e00c4f34b757db40c21dc9505732a6ac190

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