Malicious PDF — malware analysis report

Static analysis result for SHA-256 8898140a623d20ac…

MALICIOUS

PDF

66.3 KB Created: 2020-12-23 23:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: daadb9742f8d267631afe95211292de4 SHA-1: 7c00ec9795a48989488715b078024e38f4941f03 SHA-256: 8898140a623d20ac8f704e5db8d9c3ac2802fe76ab962e652de7c2ccb3ded427
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a significant number pointing to a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to obscure the final destination. The ML classifier strongly flags this PDF as malicious, and the presence of embedded URLs suggests an attempt to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=cartoon+video+song+status+download+sharechat PDF link annotation
    • https://cdn.sqhk.co/xivumatozo/R4iRJk0/givumuvuzufadobuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fbbbd1972745.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/hcjegep/72663938828.pdfIn PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/viwosimoletefikefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5fc6c0c8129c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fb6d84aa5965.pdfIn PDF document text
    • https://cdn.sqhk.co/sevimifogu/fii2Fhf/sowovumewineveb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5faac26398c7c.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/04c27f4e-a112-4cfe-a556-37157d04af43/17028420394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0219554c-a959-4d24-8d24-d430a8cea54b/billy_la_bufanda_lyrics_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7863f7-bfbf-47df-8c25-cf0747b1525d/stellar_data_recovery_activation_key_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/didajemuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126f44b7-2740-43b3-9860-66399b6fb37b/36261940167.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/87482150933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bd1a06-3c33-4dd4-ad4c-15c5e9dc6a0e/homedics_ultrasonic_humidifier_manual.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_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 5256 bytes
SHA-256: 6b7b47a65de5265b6601da64732c97e784c71e1e16d565dc7532b1327cf986fb
font_01_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 9988 bytes
SHA-256: 494eb363155ca205362ee02e5023062ad435687fec18390199eabf9521d6b935

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