Malicious PDF — malware analysis report

Static analysis result for SHA-256 822b489ca3129a59…

MALICIOUS

PDF

68.9 KB Created: 2020-12-18 22:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4b80dd02382f88f69879598b852613ff SHA-1: 980621de714bde74f3cda51f1104e8ccc8877635 SHA-256: 822b489ca3129a592dc371655503844f5ae517e462a54bedc4748256390e04f3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan payload delivery. The document body text, though heavily obfuscated, appears to be a lure for a service manual download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/strik?utm_term=john+deere+l118+service+manual+free+download In PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/vaxologo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_5f9be86af1873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_5fba8ec399bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f9bd98dc75bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f891a1df3fff.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/minefakejinagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51393485235c86bd0862/1606373690448/wonder_woman_cosplay_diy.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/15433354747.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3242724b06a7eb30dea98/t/5fcaba97d9db584c6eadbea5/1607121560296/zixikijexuroma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940511f1-7c6e-4886-933d-ac079a7dd1ca/sugar_packets_production.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/50515989881.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/performance_appraisal_definition_by_different_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/6063593010.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_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 5648 bytes
SHA-256: bc251ef288f96f1522ba17507dcb719d1d8085c9bac1cd1692edee91df6dd5c9
font_01_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 11068 bytes
SHA-256: c04eca7c1bdf168f8a4934d7328aa6b367eeaf85fa85cd6b70c6cb85affc7408

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