Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c41774e6202b5a4…

MALICIOUS

PDF

69.1 KB Created: 2020-11-18 04:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0767d7a0616b42af784be378b0ab7d89 SHA-1: ddf31e4fa44df6e783a5b7ec4126019186af1348 SHA-256: 3c41774e6202b5a41a434140dd10c7c0ee1980b739744cdde2579e22e4c3e7c4
164 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, many of which are numeric or keyword-based, suggesting a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=menage+romance+novels+free+download PDF link annotation
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/3098575.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/7695563.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/4279890.pdfIn PDF document text
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/b24bbc02.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/a9f8c963-acd3-489a-9723-3aee1b44e2b6/6089614041.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/billing_system_project_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/44857981063.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/abnormal_gait_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/tapubaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084f797e-0cda-4119-b77b-788db71a61d9/cl4940_at_t_standard_phone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fd3acb-edb6-4f82-9b2f-2574c305da5d/samsung_scs-2u01_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/statin_guidelines_2018_uspstf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be84af5-ee05-455f-a3da-af7bb26046db/bolileremadebuzemuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20aacad3-fc4c-46ed-8887-7b33d40f0804/winolaparebizuxewapejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101d1ba9-7d75-47c9-b665-e30946434629/21629822375.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_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 5496 bytes
SHA-256: 8b6bc1885ae62d241f60105824d19e4bf15618f03c86da89e1fdaa89a7603f29
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 15416 bytes
SHA-256: 6e94a84eeb11ec39ff4d42e146f4ae11bca1838c746451c820e4598283824df5

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